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Патент USA US2403543

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2940395433
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July 9, 1946.
2,403,543
w.v H. NEWELL
GUNFIRE CONTROL COMPUTER
Filed Feb. 19, 1941
2 Sheets-Sheet 1
US
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INVENTOR
William lLNeweZl
Z572 JAM/
ATTORNEY
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?35, REGiSRtHS;
‘July 9, 1946.
w, H_ NEwE‘LL
2,403,543
GUNFIRE CONTROL COMPUTER
Feb- 19,
2 sheets-sheet 2
PREATIONPERIOD.
TARGETSPED
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COBAMLPUISTER
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INVENTOR
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Patented July 9, 1,946
2,403,543 ’
UNITED STATES PATENT OFFICE
2,403,543
GUNFIRE CONTROL COIWPUTER
William H. Newell, New York, N. Y., assignor to
Ford Instrument Company, Inc., Long Island
City, N. Y., a corporation of New York
"
Application February 19, 1941, Serial No. 379,632
7 Claims. (Cl. 235-615)
1
2
This invention relates to gun-?re control com
of the observations, for computing the sight angle
puters and particularly to that typeof computers
or difference in elevation of the gun and the line
of sight at the instant of ?ring and the time
setting values of the fuses of the ?red projec
tiles.
used to control the ?ring of guns against air
craft.
The problem of the control of gun-?re against
aircraft may be divided into two classes; (1)
Where the aircraft or target is approaching di
rectly towards its objective or the point of ob
servation and the ?ring gun, and (2) where the
target is passing at a distance to one side or the 10
other of the observing and ?ring point. The in
vention herein disclosed is applied to the ?rst
mentioned class. It will of course be understood
that some of the principles thereof are applicable
to the solution of problems of the second men 15
tioned class.
In considering the solution of the problem of
Mechanisms for accomplishing the objects of
the invention and their operation will be under
stood by considering the following description and
accompanying drawings in which:
Fig. 1 is an elevation side view of an aircraft
target directly approaching an observing and ?r
ing point at a constant height and showing the
consecutive angular and linear relations of the
target to the observing and ?ring point; and
Fig. 2 is a diagrammatic view of a mechanism
to compute the values required in the control of
the ?re of the gun.
'
Referring particularly to Fig. 1, an aircraft
or target I is directly approaching the observ—
sumed that the target is directly approaching its 20 ing and ?ring point 0 at a constant height (H)
objective, which is the point of observation and
above the horizontal O—O' and at a horizontal
. the point of ?ring of the gun, at a substantially
speed of St.
constant height above the horizontal plane of the
When the target I reaches point A, observers at
objective, such as would be done in horizontal
O observe the slant range (R) and the elevation
bombing of a selected point. Upon the picking
angle of the target (Al ), from which the height
up of the target by observers at the objective,
(H) and the horizontal range (RH) may be cal
culated by the equations resulting from the right
the slant range of the target and its elevation
angle triangle 0AA’ of H=R sin A1 and RH =R
above the horizontal, expressed in angular units,
cos A1, respectively. A’ is the projection of the
are observed by instruments well known in the
art and from the observed data the height of the 30 point A on the horizontal 0-0’.
g
target and the horizontal range may be deter
The preparation period of time (X) is selected
anti-aircraft ?re control to which this invention
is applied as one embodiment thereof, it is as
‘mined, or if the height of the target is known or
obtained by observations and the elevation is ob
served, the slant range and the horizontal range
may be determined.
35
From experimental data obtained during target
as required and added to the time of flight (t) of
the projectile as obtained from ballistic tables or
curves and the sum is multiplied by the speed of
the target (St) to give the distance traveled
by the target during the time (X +t) , represented
by the line AC, thus de?ning the intercept point
C at which the target will be at the end of the
time of ?ight period. The value of AC may be
practices, the most effective ranges of the guns
are known as well as the time‘in seconds re
quired to set and adjust the sights and the fuses
of the projectiles and to load and ?re the pro 40 expressed by the equation
jectiles. In this speci?cation, the time required
to set the observed values into the mechanisms,
AC=(X+t) St
(1)
The horizontal range of the target I at point C
for the mechanisms to calculate the advance
(RHZ) is equal to the observed horizontal range
range or fuse setting and the sight angle, and
the time required to adjust the sight and gun and 45 minus the distance AC‘ or
load'and ?re the gun is de?ned as the “prepara
RH2=RH— (X+t) St
(2)
tion period of time.” This preparation period
or
is arbitrarily selected and is based upon experi
ence under various circumstances of operation.
The object of the invention is to provide a 50 From the right angle triangle OC‘C' the elevation
of the target at point C (A2) will be the angle
mechanism settable in accordance with an ob
whose tangent is the height divided by the hori
served range or height and elevation of an ap
zontal range to the point C or
preaching aircraft target and settable in accord
ance with the speed of the target and the selected
preparation period of time following the instant 55
A2 : tan-1m
2,403,543
4
The travel of the target during the time of ?ight
is equal to the speed of the target multiplied by
(X) is set into the conventional multiplier 23
by crank 24, shaft 25, clutch 26, shaft 21, shaft
28, differential 29 and shaft 30. Target speed
the time of ?ight or t-St and is indicated on Fig. 1
by the line BC, or
BC=t-St
(St) is determined from observation or otherwise
and set into multiplier 23 by crank 3| and shaft
(5)
This distance determines the point B or the posi
tion of the target at the time the gun is ?red.
It is obvious that 0B’ represents the horizontal
range to the ?ring point (EH3) , and that
10
The elevation angle of the firing point (A3) is
obtained from the right angle triangle 03B’ and 15
is the angle whose tangent is the height divided
by the horizontal range to the ?ring point (RH3)
or
'
A3=tan ‘EH3
(7)
20
The elevation of the gun above the line of sight
to the point B, to allow for the movement of the
target during the time of ?ight is known as verti
cal angular de?ection (Ut) and ‘may be expressed 25
as
vUt=A2--A3
(8)
Also from ballistic tables and curves obtained
from experimental data the correction in eleva
tion, known as super elevation (e), that must be 30
applied to compensate for the shape of the tra
jectory of the projectile, is known for various
combinations of horizontal ranges and heights.
The total elevation of the gun above the line of
sight is known as sight angle (Us) and may be 35
expressed as
Us=Ut+e
(9)
Referring particularly to Fig. 2, the vector an
32. The values of X and St thus set into the mul
tiplier 23 are made visually available by dials 33
and 34 geared, respectively, to shafts 28 and 32.
The value of the time of ?ight period (t), rep
resented by the rotation of shaft 38 is set into
multiplier 23 by connecting shaft 38 to the third
side of differential 29 where it is combined with
the preparation period of time (X) from shaft
28, so that the output shaft 39 of multiplier 23
represents the line A--C of Fig. 1, or the change
in horizontal range during the preparation period
and the time of ?ight period as shown in Equa
tion 1. The mechanism for generating the value
of t will be described hereinafter.
It will be seen from Equation 3, that, having
set the selected value of preparation period (X)
by crank 24 and the observed value of target
speed (St) by crank 3| so the resultant position
of output shaft 39 of multiplier 23 represents the
distance AC or (X-I-t) St, the position of shaft
I9 as set by handle I8 will represent the hori
zontal range (EH2) when the wire II is brought
to intersect the range scale 4 at the point repre
senting slant range (R).
The value of the period of time of ?ight of
the projectile is obtained by connecting shaft III,
the position of which represents horizontal range
(RH2), and shaft I6, the position of which rep
resents height (H), to a conventional three-di
mensional cam unit or ballistic computer.
The cam 40 of this unit consists of a solid
rotated by the shaft I9 representing horizontal
range (RH2). The surfaces of the various lat
eral cross-sections of the solid along its axis form
alyzer or component solver 2 includes a disk 3 40 a cam surface to give to cam follower 4| a motion
with a radial range scale 4 and index 5 engraved
proportional to the time of ?ight of the pro
thereon. The disk 3 is rotated about its axis
jectile for the range represented by the rota
by gears 6 turned by shaft 1 to positions repre
tional position of the cam and the value of height
senting angles of elevation of the target I. Index
represented by the axial position of the follower
5 cooperating with scale 8 indicates the angular 45 4|. The cam follower 4| is positioned parallel
setting of disk 3.
to the axis of the cam 40 to engage the various
Movable at right angles to each other and in
lateral sections of the solid cam in accordance
suitable guides are slides 9 and III each of which
with the value of height (H), as represented by
carries a stiff wire, I I and I2 respectively, mount
rotational position of the threaded portions of
50
ed to extend perpendicular to the direction of
movement of its respective slide. Cross wire I2
shaft l6, which engages the threaded carriage
4Ia on which follower 4| is mounted for rota
cooperates with scale I3 to visually indicate the
tional movement. Cam follower 4| is kept in
height (H) of the target represented by the rela
engagement with the cam surface by spring 42
tive position of slide I0 and the position of wire
II relative to the center of disk 3 indicates the 55 and its motion is transmitted to elongated gear
43 on shaft 38 by the toothed sector 44 to which
horizontal range represented by the position of
follower 4| is secured. Shaft 38 is connected
the slide 9.
to
differential 29 to introduce time of ?ight into
After setting the preparation period of time
multiplier 23 as previously described.
(X) and the target speed (St), as will be here
It will be seen, as shaft I9 is turned by handle
inafter described, the disk 3 is rotated by handle 60
I8 to bring the range wire II of vector analyzer
I4 turning shaft 1 until the index 5 is opposite
2 to its proper intersecting point for the observed
the observed elevation of the target (AI). Slide
values of range and elevation, that the connec
III is moved by handle I5, shaft I6 and gears I'I
tion of shaft I9 to the cam 40 will modify the
until wire I2 crosses range scale 4 at the observed
slant range (R). Slide 9 is moved by handle 65 time of ?ight input to multiplier 23 and in conse
quence, the output shaft 39 will be moved to ad
I8, shaft I9, through differential 20 and by shaft
ditionally move the shaft 2| and the range wire
2| and gears 22 until wire I I intersects the range
I I, that is, the movement of shaft I9 has a direct
scale 4 at the observed slant range (R). The
effect on the position of wire II through differ
positions of slide 9 and shaft 2| therefore repre
ential 20, and an indirect effect through cam
sent the observed-instant horizontal range (RH)
40, follower 4|, sector 44, gear 43, shaft 38, dif
of the target and the positions of the slide I0 and
shaft I6 represent the height of the target (H).
ferential 29, shaft 30, multiplier 23, shaft 39 and
differential 20.
The position of shaft I 9 represents the horizontal
range (RH2).
The clutch 26 is actuated by a lever 45 and is
The length of the preparation period. of time 75 normally held in a closed position by the spring
bgd'fgli nous
sits
2,403,543
5
46. The gear 41 is mounted on shaft 35 and
driven by gear 36 on shaft. 28. A spring 48
around shaft 35 is secured at one end to gear 41
and the other end to the frame of the instru
ment. A stop pin 49 is mounted on gear 41 and
a cooperating stop pin 50 is secured to the frame
of the instrument. The gear 41 is so set relative
to the shaft 28 that when the dial 33 is at zero
6
g and shaft 6|, are proportional to the super eleva
tion (e).
As the sight angle (Us) from Equation 9 is
equal to the sum of the elevation angle (Ut) and
the super elevation (e) the movements of shafts
56 and 6| are combined in differential 62, the
output of which is transmitted to visual dial 63
by shaft 64 and gear 65. Corrections may be ap
the pin 49 is against the ?xed stop pin 50 and the
plied to the sight angle by moving ring‘ dial 66,
spring 48 is under initial tension tending to hold '10 which is mounted coaxially with dial 63 and has
the stop pins in engagement. As the setting is
an index thereon cooperating with the scale on
made to introduce the predetermined value of the
dial 63. Movement of dial 66 is had by moving
preparation period of time the gear 41 is rotated
handle 61 on shaft 68 which is geared to dial 66.
to move stop pin 49 away from the ?xed pin 56
Values of de?ection (Ds) clue to drift which are
and the tension of spring 46 is increased.
proportional to the super elevation (e) are made
When the previously described settings have
visually available by dial 69 which is geared to
been made the preparation period of time (X) is
shaft 6|. Corrections to de?ection may be added
removed from multiplier 23 by moving lever 45
by moving ring dial 10 which is mounted coax
against the tension of spring 46 thereby opening
ially with dial 69 and has an index thereon coop
clutch 26. This permits gear 41 to be rotated 20 erating with thescale of dia1 69. Dial, 19 is
‘ backwards under the force of spring 48, until stop
moved by crank ‘H on shaft 12, which is geared
pin 49 on gear 41 comes up against stop pin 50
to dial 10.
The values for determining the fuse settings
mounted on the frame of the instrument, when
are made visually available by connecting fuse
dial 33 and shaft 28 are returned to their zero
positions.
dia1 13 to shaft 38, the position of which repre
When the shaft 28 is returned to represent zero
sents time of ?ight (t), by shaft 14. Corrections
to fuse settings may be added by moving ring
value of the preparation period (X), it will be
seen that the input movement to multiplier 23 by
dial 15 mounted coaxially with dia1 13 and with
an index and scale thereon cooperating with the
shaft 36 is equal to time of ?ight (it) alone and
therefore the resulting position of output shaft 30 scale of dial ‘l3. Dial ‘I5 is moved by crank 16 on
39 represents target speed multiplied by time of
shaft 11, which is geared to dial ‘I5.
/
It is obvious that various changes may be made
by those skilled in the art in the details of the
As shaft I9 is held by the handle 18 at the
invention as disclosed in the drawings and de
previously determined value of horizontal range
scribed above within the principle and scope of
(RH2)' and shaft 39 now presents t-St or the
the invention as expressed in the appended
distance B—C of Fig. 1, the position of shaft 2|,
claims.
I
slide 9 and range wire I I, determined by the con
I claim:
'
nections to shafts l9 and 39 through differential
1. Apparatus for use in the aiming of a gun for
20, now represents RH 2+t-St which‘ equals hori
zontal range (RH3) (see Equation 6).
40 ?ring a projectile at a target approaching at a
With slide 9 and Wire i l (shown in dotted line)
cocnstanwthheight above a horizontal plane, com
prising a vector analyzer having a range scale
now moved to the left to the position correspond
angularly settable in accordance with the eleva
ing to horizontal range (EH3), disk 3 is turned
tion of the target at an observing instant and
to the left by handle l4 and shaft 1 until the
?ight (t-St).
radial line of the range scale 4 is directly oppo
site the intersection of wire ll (dotted position)
and wire 12. In this position the rotational posi
tion of disk 3 and shaft 1 represent the elevation
of the target at point B (A3), as shown by Equa
tion 7.
With shaft l9 still held in the position repre
including a ?rst slide settable relative to the range
scale to positions in accordance with the corre
sponding horizontal range of the target and a
second slide settable relative to the range scale
to positions in accordance with the correspond
50 ing height of the target, means settable in accord
ance with a selected preparation period of time,
means movable in accordance with the time of
?ight of the projectile, a ?rst differential for com
bining the movements of the preparation period
senting EH2. The other input to vector solver 52
is slide 53 which is set in position by shaft l6 to 55 settable means and the time of ?ight movable
means, a multiplier connected to the output of the
represent height (H). The position of the out
?rst differential and also settable in accordance
put of vector solver 52, shaft 54, therefore repre
with the speed of the target, means settable to
sents the elevation of the target at point C or
represent the horizontal range at the end of the
elevation (A2), as shown by Equation 4.
The movements of shafts 1 and 54 are com 60 time of ?ight, a second differential actuated by
the output of the multiplier and the range settable
bined by differential 55 to obtain the value of the
means and connected to position the ?rst slide,
change of the elevation angle due to movement
ballistic computing means, having input mem
of the target during the time of ?ight, which
value is represented by the resulting rotational
bers connected to the range settable means and
position of shaft 56, the output of differential 55.
to the said second slide, said ballistic computing
means including an output moved in proportion
This value is generally known as vertical de?ec~
tion due to movement of the target during the
to the time of ?ight, and motion transmitting
time of ?ight (Ut) as shown by Equation 8.
means connecting the output of the ballistic com
The value of super elevation (e) is obtained by
puting means and the time of ?ight movable
a three-dimensional cam 51 which is‘ in all re
means, whereby the output of the multiplier
spects in construction and operation similar to
represents change in horizontal range of the
cam 49, except that the surface of the solid is
target during the preparation period and the
time of ?ight.
such that for the inputs of height (shaft I6) and
horizontal range (shaft I9) the movement of cam
2. Apparatus for use in the aiming of a gun for
follower 58, toothed sector 59, elongated gear 66
?ring a projectile at a target approaching at a
senting the value of horizontal range (RHZ) , slide
5| of vector solver 52 is also in a position repre
2,403,543
8
angularly settable in accordance with the eleva
tion of the target at an observing instant and
including a ?rst slide settable relative to the
range scale to positions in accordance with the
corresponding horizontal range of the target and
differential connected to the range scale angular
setting means of the vector analyzer and to the
output of the vector solver, a second ballistic
computing means having input members con
nected to the range settable means and to the
said second slide, said second ballistic computing
means including an output ‘moved in proportion
a second slide settable relative to the range scale
to the super elevation, and a fourth differential
constant height above a horizontal plane, com
prising a vector analyzer having a range scale
connected to the output of the third differential
to positions in accordance with the corresponding
height of the target, means settable in accordance 10 and to the output of the second ballistic com
puting means whereby the output of the fourth
with a selected preparation period of time includ
differential represents the sight angle of the gun
ing a zero setting stop, means movable in accord
when the resilient means is released to return the
ance with the time of ?ight of the projectile, a
?rst differential for combining the movements
preparation period settable means to its zero
time of ?ight movable means, a multiplier con
means is adjusted to bring the range scale into
nected to the output of the ?rst differential and
also settable in accordance with the speed of the
target, means settable to represent the horizontal
range at the end of the time of ?ight, a second
differential actuated by the output of the multi—
correspondence with the position of the second
slide and the resulting position of the ?rst slide.
of the preparation period settable means and the 15 setting stop and the range scale angular setting
plier and the range settable means and connected
to position the ?rst slide, ballistic computing
means having input members connected to the
4. In apparatus for use in the aiming of guns,
a vector analyzer having a graduated range scale
angularly settable to represent the position of
Margret, means for initially setting said scale in
accordance with the observed angular relation
of the target from an observing station, a pair
range settable means and to the said second slide, 25 of com nenirrrrembersassociated with said scale,
means for setting one of said component mem
said ballistic computing means including an out
bers in accordance with the height of the target
vput moved in proportion to the time of ?ight,
corresponding to thegmtion o'f‘said-range
motion transmitting means connecting the out
scale representing the observed range of the
put of the ballistic computing means and the
time of ?ight movable means, resilient means 30 target, means for partly setting the second of
said component members in accordance with the
connected to the preparation period movable
present horizontal range corresponding to the
means for moving the said movable means to the
graduation of said range scale representing the
said zero setting stop and releasable setting means
observed range of the target, means for addi
for adjusting the preparation period movable
35 tionally setting the second of said component
means.
3. Apparatus for use in the aiming of a gun
for ?ring a projectile at a target approaching at
a constant height above a horizontal plane, com
prising a vector analyzer having a range scale
angularly settable in accordance with the eleva
members in accordance with the output of a mul
tiplying mechanism having two input members,
means for actuating one of said input members in
accordance with the target speed, means for actu
ating the other of said input elements in accord
ance with the time of ?ight of the projectile and
a selected time interval, means for eliminating
the effect of the selected time interval on the mul~
tiplier, whereby the said second component mem
ber is moved to represent the horizontal range
tion of the target at an observing instant and
including a ?rst slide settable relative to the
range scale to positions in accordance with the
corresponding horizontal range of the target and
a second slide settable relative to the range scale
at the termination of the selected time interval,
to positions in accordance with the corresponding
a vector solver having one component input di~
height of the target, means for angularly setting
rectly actuated by the means for partly setting
the range scale, means settable in accordance
the second of said component members in accord
with a selected preparation period of time in
cluding a zero setting stop, means movable in 50 ance with the present horizontal range and a
second component input actuated by the means
accordance with the time of ?ight of the projec
for setting one of said component members in
tile. a ?rst di?erential for combining the move
accordance with the height and having a vector
ments of the preparation period settable means
member angularly positioned in accordance with
and the time of ?ight movable means, a multi
plier connected to the output of the ?rst differen 55 the setting of the said component inputs, means
for combining the resulting angular position of
tial and also settable in accordance with the speed
the vector member with the means for angularly
of the target, means settable to represent the
setting the ?rst mentioned vector, whereby the
horizontal range at the end of the time of ?ight,
output of the combining means represents the
a second differential actuated by the output of
the multiplier and the range settable means and 60 angular movement of the target during the time
of ?ight when the vector range scale is set in
connected to position the ?rst slide, ballistic com~ ,
accordance with the intersection of its associated
puting means having input members connected
component members after the elimination of the
to the range settable means and to the said second
effect of the selected time interval.
slide, said ballistic computing means including
5. In apparatus for use in the aiming of guns,
an output moved in proportion to the time of 65
a vector analyzer having a graduated range scale
?ight, motion transmitting means connecting the
angularly settable to represent the position of a
output of the ballistic computing means and the
target, means for initially setting said scale in
time of ?ight movable means, resilient means
accordance with the observed angular relation
connected to the preparation period settable
of the target from an observing station, a pair
means for moving the said settable means to the
of component members associated with said scale,
said zero setting stop, releasable setting means
for adjusting the preparation period movable
means for setting one of said component mem
bers in accordance with the height of the target
means, a vector solver having two component
corresponding to the graduation of said range
members connected to the said second slide and
to the range settable means respectively, a third 75 scale representing the observed range of the
LOU!
HLU‘O I Lllun
secret. tics
2,403,548
9
target, means for partly setting the second of
component members in accordance with the pres
ent horizontal range corresponding to the gradua
tion of said range scale representing the observed
range of the target, means for additionally setting
the second of said component members in accord
10
able in accordance with the time of ?ight of the
projectile, differential means for combining the
movement of the preparation period means and
the time of ?ight means, means settable in accord
ance with the rate of movement of the target,
multiplying means actuated by the differential
ance with the output of a multiplying mechanism
means and the rate settable means, means settable
having two input members, means for actuating
to represent the horizontal range of the target
one of said input members in accordance with the
at the end of the time of ?ight, combining means
target speed, means for actuating the other of 10 actuated by the multiplying means and the range
said input elements in accordance with the time
settable means and connected to position the
of ?ight of the projectile and a selected time
?rst slide, whereby the position of the ?rst slide
interval, means for eliminating the e?ect of the
selected time interval on the multiplier, whereby
the said second component member is moved to
represent the horizontal range at the termina
tion of the selected time interval, a vector solver
having one component input directly actuated by
indicates the horizontal range of the target at
the observing time, and means for selectively
moving the preparation period settable means to
engage the zero setting stop, whereby the effect of
said preparation period settable means on the
multiplier is removed and the ?rst slide is posi
the means for partly setting the second of said
tioned to indicate the horizontal range at the
component members in accordance with the pres 20 instant of ?ring.
~,
ent horizontal range value and a second com
7. Apparatus for use. in the aiming of a gun
ponent input actuated by the means for setting
for ?ring a projectile at a target approaching at
one of said component members in accordance
a constant height above a horizontal plane, com
with the height and having a vector member
prising a vector analyzer having a range scale
angularly positioned in accordance with the set—
angularly settable in accordance with the eleva
ting of the said component inputs, means for
tion of the target at an observing instant and
combining the resulting angular position of the
including a ?rst slide ‘settable to positions in
vector member with the means for angularly
accordance with the horizontal range of the target
setting the ?rst mentioned vector, whereby the
and a second slide settable to positions in ac
output of the combining means represents the 30 cordance with the height of the target, means
angular movement of the target during the time
settable in accordance with a preparation period
of ?ight when the vector range scale is set in ac
of time including a zero setting stop, means mov
cordance with the intersection of its associated
able in accordance with the time of ?ight of the
component members after the elimination of
projectile, differential means for combining the
the effect of the selected time interval, ballistic
movement of the preparation period means and
computing means settable by the means for set
the time of ?ight means, means settable in accord
ting one of said component members in accord
ance with the rate of movement of the target,
ance with the height and by the means for partly
multiplying means actuated by the differential
setting the second of said component members
means and the rate settable means, means settable
in accordance with the present horizontal range 40 to represent the horizontal range of the target
value including output means moved in propor
at the end of the time of ?ight, combining means
tion to the time of ?ight of the projectile and
actuated by the multiplying means and the range
the super elevation respectively, means for trans
settable means and connected to position the ?rst
mitting the time of ?ight output means of the
slide, whereby the position of the ?rst slide indi
45
ballistic computing means to the multiplying
cates the horizontal range of the target at the '
mechanism, and means for combining the super
observing time, ballistic computing means having
elevation output of the ballistic computing means
input members connected to the means settable
with the output of the last mentioned combining
to represent the horizontal range of the target
means whereby a part is positioned to represent
at the end'of the time of ?ight and to the second
the sight angle.
_ 50 slide, said ballistic computing means including
6. Apparatus for use in the aiming of a gun for
an output moved in proportion to the time of
?ring a projectile at a target approaching at a
?ight, motion transmitting means connecting the
constant height above a horizontal plane, com
output of the ballistic computing means to the
prising a vector analyzer having a range scale
time of ?ight movable means, and means for selec
angularly settable in accordance with the eleva~ 55 tively moving the preparation period settable
tion of the target at an observing instant and
means to engage the zero setting stop, whereby
including a ?rst slide settable to positions in
the effect of said preparation period settable
accordance with the horizontal range of the target
means on the multiplier is removed and the ?rst
and a second slide settable to positions in accord
slide is positioned to I indicate the horizontal
ance with the height of the target, means set 60 range at the instant of ?ring.
table in accordance with a preparation period of
time including a zero setting stop, means mov
WILLIAM H. NEWELL.
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