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Патент USA US2403505

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SF2
GR
m4039595
July 9, 1946.
R. E. cRooKE
TORPEDO DIRECTOR
Filed May 15,_ 1941
3 Sheets-Sheet 1
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R_ E, CROQKE
'2,403,505
ToRPEDo DIRECTOR
Filed May 15, 1941
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ATTORNEY
July 9, 1946.
R. E. CROOKE
2,403,505 ’
.TORPEDO DIRECTOR
Filed May 115, , 1941
3 Sheets-Sheet 3
âjg. 5
55
60
--99 y
INVENTOR
‘
_ Raymond E'. Ürooke
'
-
ATTORNEY
dtml pour
Patented July 9, 1946
2,403,505
UNITED STATES PATENT OFFICE
2,403,505
TCRPEDO DIRECTOR
Raymond E. Crooke, Great Neck, N. Y., assignor to
Ford Instrument Company, Inc., Long Island
City, N. Y., a corporation of New York
Application May 15, 1941, Serial No. 393,565
4 Claims. (Cl. 23S-61.5)
1
2
This invention relates to a torpedo director
and more particularly to a torpedo director for
determining the gyro angle setting for a torpedo
'set in accordance with the component of move-`
ment of the target perpendicular to the line of
bearing to the target, and in accordance with
to be discharged from a torpedo tube which is
the present range to the target modified by the
iixed with respect to the firing ship, so that the
range component .of distance moved by the tar
torpedo has to describe a, curved path until it
get during the time of run. The resulting angu
has attained the direction of the straight path
lar position of the vector member of the vector
to the point of intercept with the target.
solver therefore represents the angular offset of
The principal object of this invention is to
the point of intercept from the set line of bear
provide mechanism for computing the gyro angle 10 ing and the length of the vector represents the
for the torpedo including an offset or parallax
distance from the observing point to the point of
intercept.
angle to allow for the curved portion of the tor
pedo’s path.
A pair of cam mechanisms, whose input mem
Another object is to provide mechanism to de
bers are positioned in accordance with the dis
termine and indicate the distance the torpedo 15 tance from the observing point to the point of
will be required to run to reach the point of
intercept and the direction of the torpedo path
intercept with the target.
or gyro angle relative to the torpedo tube, deter
Another object is to provide mechanism, which,
mine (1) a correction factor to be included in
when set in accordance with known values rep
the determination of the gyro angle to allow for
resenting the present relative positions of the
the offset due to the curved portion of the tor
target and ñring ship and the rate and direc
pedo lpath, and (2) a correction to be applied
tion of movement of the target, will automatically
to the distance from the observing point to the
indicate the gyro angle or direction of straight
point of intercept to give a value which when di
run of the torpedo and the distance the torpedo
vided by the torpedo speed will give the time
must run to reach the point of intercept with the 25 of run of the torpedo.
target.
A correction factor is also determined to modify
Other objects of the invention will be apparent
the gyro angle to allow for the effect of the ro
from a consideration of this speciñcation and the
tation of the earth on the gyroscope of the tor
accompanying drawings.
pedo during the time of run.
'
The Various objects of the invention are at-. 30 The preferred form of mechanism for carry
tained by mechanism which includes dials repre
ing out the invention is shown in the accom
senting the relative position and direction of
panying drawings, in which:
movement of the target and firing ship and hand
` Fig. 1 is a geometrical sketch showing the re
cranks or automatic means for setting the dials
lation of the factors involved in solving the
including a sight which may be trained to be 35 problem;
pointed at the target. A component solver is
Figs. 2 and 3 taken together are a diagrammatic
angularly set by the means for setting the dials
representation of mechanism for solving the prob
so that the angular position of its vector mem
lem indicated in Fig- 1.
ber represents the direction of movement of the
Referring particularly to Fig. 1, the observ
target relative to the present line of bearing be 40 ing point or periscope of the firing ship is rep
tween the observing sight and the target and the
resented as o and the course of the firing ship rel
length is set to represent the speed of the tar
ative to north (N) is represented as Co. 'I'he tar
get. The movement of the two component slides
get is represented at b as proceeding on a course
of the component solver represent the components
CT relative to north. The path of the torpedo is
of the target speed along and across the present 5 represented as a curve extending from o to the
bearing line from the firing ship to the target.
line ac into which it merges when the torpedo
A pair of multipliers are provided wherein the
settles down on its steady course. The line ac
component rates of movement of the target as
is obtained by extending in a reverse direction
determined by the component solver are multi
the line representing the path of the torpedo
plied by the time of run of the torpedo to give
after it has settled on its steady course, until it
Voutput movements representing the component
intersects the line representing the extended cen
distances the target will move during the time of
terline of the ñring ship or more specifically the
run, along and perpendicular to the set line of
centerline of the torpedo tube. The point of in
bearing to the target.
tercept or the advance position of the target,
The component slides of a vector solver are 55 that is, where the torpedo hits the target is rep
2,403,505
3
4
resented as c. The gyro angle of the torpedo and
therefore the direction of the straight portion of
the path of the torpedo with reference to the
centerline of the firing ship is represented as
G2. The relative bearing of the target from
the periscope of the firing ship and measured
from the centerline of the iiring ship is repre
sented as Bs and the true bearing relative to
north is represented as B. It will be seen that
the relation of these angles may be expressed as
tor 9 in the well known manner so th'at the rota
tion of shaft I2 represents the course of the ñring
ship. The shaft I2 may be positioned by means
B=Co+Bs
(1)
The target angle or track angle of the target
is represented as BT which is the angle from
the centerline of the target to the line of bearing
to the ñring ship as viewed from the target. It
will be seen that this angle may be expressed as
of the hand crank I4 in case of failure or absence
of the receiver motor 9 and servo motor Il. The
hand crank I4 is connected to th'e shaft I2 by
means of the coupling I5 when desired.
The shafts 3 and I2, the rotation of which
represent relative bearing (BS) and firing ship’s
course (Co), respectively, are connected to shaft
I6 through diiîerential I'I. The rotation of shaft
I6 represents the true bearing (B) of the target
as will be seen from Equation l.
The shaft I6
drives a ring dial I8 surrounding the firing ship
dial 6 through gears I9 and a second ring dia1 20
through gears 2|.
Th'e ring dial 20 surrounds a
target dial 22. The ring dial I8 indicates'true
bearing (B) of the target when read against the
BT=(180°+B) -CT
(2)
ñxed index 8 and course of the ñring ship (CO)
The present or observed range of the target 20 when read against the fbow of the ñring ship im
from the ñring ship is represented by R and the
age on the dial 6.
distance from the observing point o to the point
The ring dial 20 when read against the fixed
of intercept c is represented as oc or RI. The
index 23 indicates the complement of the true
actual run of the torpedo is represented as R2.
bearing (B) as indicated by the ring dial I8 read
The line bc represents the travel of the target 25 against the fixed index 8. The target dial 22 in
during the run of the torpedo and may be ex
dicates target course (CT) when the bow of the
target image is read against the ring dial 20 and
pressed as
bc=t - ST
(3)
target angle (BT) or track angle is obtained or set
by reading the target dial 22 against the ñxed in
inwhich t represents the time of run of the tor
pedo and ST represents the speed of the target. . " 30 dex 23. The target dial 22 is set relative to the
ring dial 20 by means of a hand crank 24 and
The components of the travel of the target, line
shaft 25 which actuate Shaft 26 through differ
bc, taken along and perpendicular to the bearing
ential 21. The third member of diiferential 21 is
line ob are represented as t-YT and t-XT respec
connected to shaft I6,`th'e rotation of which rep
tively and may be expressed mathematically as
35 resents true bearing (B). The rotation of the
hand crank 24 and shaft 25 represent target
course (CT).
It will be seen from Equation 2
that the rotation or position of shaft 26 and dial
The angle DT is the angular displacement of the
22 represent target angle (BT).
point of intercept c relative to the line of bearing
Shaft 26, the rotation of which represents tar
ob as measured from the observing point o. This 40
get angle, also controls th'e angular position of
angle DT is the angular oiîset which would be re
the vector of a component solver 28 through gears
quired from the line of bearing ob for a iictitious
29 and vector gear 30. The length of the vector
torpedo discharged from the point o. 'I’he angle
or radius to the pin 3| which is slidably mounted
GI represents the course of such a torpedo meas
in a radial slot in the gear 30 is controlled by a
ured from the centerline of the ñring ship. It
spiraled cam in the gear 32 concentrically mount
will be seen that the value of this angle may be
ed to gear 30. The gear 32 is rotated relative
expressed mathematically by the equation
to the gear 36 by a hand crank 33 and dial 34 the
rotation of which represent target speed (ST).
The angle PG is a form of parallax angle required 50 The dial 34 is rotated by a worm 35 mounted on
shaft 36 to which is secured the hand crank 33.
to convert the angle GI to the angle G2 to allow
The shafts 26 and 36 are connected to gear 32
for the curvature of the path of a real torpedo
through a differential 3l, shaft 38 and gears 39.
discharged from a bow tube of th'e firing ship.
The component slides 40 and 4I of the compo
This angle PG may be determined as a‘function
of the run of the torpedo R2 and the gyro angle 55 nent solver 28 are located by the pin 3| to repre
sent the component YT of the rate of movement
G2 or of the distance RI and the angle GI. The
of the target along the line of bearing ob and the
value of the gyro angle G2 may be expressed as
component XT of the rate of movement of the
target across or perpendicular to the line of bear
Referring to Figs. 2 and 3, the observed rela 60 ing. It will be seen that the position of the slide
4U may be expressed by the equation
tive bearing (BS) of the target is obtained from
the sight >or periscope I which is trained on the
target by means of the crank 2 acting through
the shaft 3 and worm 4 to turn the worm gear
and the position of the slide 4I may be expressed
5 on which the sight is mounted. The shaft 3 65
also drives a dial 6 by means of gears 1. The dial
as
XT=ST sin BT
(9)
The slide 40 has a rack 42 which meshes with
the iixed index 8 indicates the observed or pres
a gear 43 to position a shaft 44 in accordance
_ent relative bearing of the target.
with the component YT and the slide 4I has a
'I'h'e course of the firing ship is received by the 70 rack 45 which meshes with a gear 46 to position
receiver motor 9 which is actuated by a master
a shaft 41 in accordance with the cross compo
compass transmitter (not shown). The receiver
nent (XT) of the rate of movement or speed of
motor 9 actuates control contacts I0 for the servo
the target (ST).
6 represents the firing ship and when read against
or follow-up motor I_I whichrdrives the shaft I2
The shaft 44, the rotation of which represents
and a response connection I3 to the receiver mo-. 76 the component YT, positions one input of a con
‘ricerca ttc@
@lo
y 2,403,505
5
6
ventional multiplier mechanism 48 and the shaft
41, the rotation of which represents the compo
connected to a diiferential 88 (see Fig. 2) whereit
is combined with the position of shaft 3 which
represents the relative bearing (BS). The out
put of differential 88 is connected to shafting 89,
nent XT, positions one input of a second conven
tional multiplier 49. The second input of both
multipliers is positioned by shafting 58 the rota
the rotation of which represents the angle GI as
tion of which represents the time of run (t) of the
torpedo. The means for determining the time of
run (t) and for rotating the shaft 58 in accord
ance therewith will be described later. The rack
will be seen from Equation 6. `
5| on the output slide of the multiplier 48 posi
tions a shaft 52 through gears 53 in accordance
The time of run tl, for the fictitious torpedo to
travel from the point o to the point of intercept
c, is expressed by the equation
10
R1
im@
(10)
with the product (t-YT) of the inputs. See
. in which SG represents the normal speed of the
Equation 4. The rack 54 on the output slide of
torpedo. It is obvious that the time‘of run (t)
the multiplier 49 positions a shaft 55 through
gear 56 in accordance with the product t-XT of 15 of the actual torpedo in traveling its longer path
will be longer than the time tl and that the
the inputs. See Equation 5.
amount of this increased time is a function of
The present or observed range (R) is set into
the angle GI and the distance RI. The time of
the mechanism by hand crank 51 and dial or
run (t) may therefore be expressed by the equa
counter 58 which are connected by shaft 59. The
shafts 52 and 59 are connected to shaft 68 20 tion
through differential 6| so that the rotation of
314.130
shaft 68 represents the present range modified
t: SG
(1l)
by the component along the line of bearing of the
in which RC represents a correction which is a
movement of the target during the time of run
of the torpedo. The value represented by the 25 function of the angle GI and distance Rl.
The correction RC is computed by a cam mech
shaft 68 may be expressed as R-l-t- YT.
anism
98 the inputs of which are the shaft 84 and
The values of the angle DT and the distance
shafting 89, the rotation of which represents the
RI are obtained from a vector solver 62, the com
distance RI and the angle GI respectively. .The
ponent slides 63 and 64 of which are positioned
in accordance with the modified range represent 30 cam mechanism may be of any suitable form and
for the purpose of illustration is shown as con
ed by the rotation of shaft 68 and the cross com
sisting of a three dimensional or barrel cam 9|
ponent of movement of the target during the run
which is rotated in accordance with the rotation
of the torpedo represented by the rotation of
of shafting 89 which represents the angle Gl.v
shaft 55. The resulting vector angle represents
the angle DT. and the length of the vector repre 35 The cam follower 92 is mounted on an arm 93
which is rotatably mounted on a threaded shaft
sents the distance oc or the run RI of the fic
94 which is driven by shaft 84 so that the arm
»titious torpedo. The vector consists of a gear
93 and the cam follower 92 are moved along the
cam 9| in accordance with the distance RI. The
ponent slides 63 and 64. While this unit is in 40 cam follower 92 is held against the cam 9| by the
spring 95 and the resultant movement of the arm
effect a vector solver, for mechanical purposes it
93 is transmitted to the elongated pinion 96 by
is actually shown in Fig, 3 as a component solver,
the sector 91 which is integral with the arm 93.
that is, the pin 66 is located radially of the gear
The rotation of the elongated pinion 96 repre
85 by a servo-motor 61 and the gear 65 is rotated
sents
the correction RC;
by a servo-motor 68. The pin 66 is moved by the 40
The shaft 98 is driven by the elongated pinion
motors 61 and 68 until the positions of the com
96 so that its rotation also represents the correc
ponent slides 63 and 64 correspond to the values
tion RC. The shaft 99 is driven by differential
represented by the rotation of shafts 68 and 55
|88 in accordance with the rotations of shafts 84
respectively.
and 98 which represent the distance RI and the
The motors 61 and 68 are controlled by the con 60 correction RC respectively. Y
trol contacts 69 and 18 respectively. The control
The shaft 58, previously referred to, is driven
contacts 69 are actuated by a differential 1| in
in accordance with the time of run (i), as
terconnecting the shaft 68 and a shaft 12 which
expressed in Equation 1l, by the output of a
is rotated in accordance with the position of com
dividing mechanism IUI, the inputs of which are
ponent slide 63 by gears 13 and a rack 14 on the 55 driven by shaft 99 and a shaft |82 in accordance
slide 63. The control contacts 18 are actuated
with the value of Rl-l-RC and the torpedo speed
by a differential 15 interconnecting the shaft 55
(SG) respectively. The shaft |82 is positioned by
and a shaft 16 which is rotated in accordance
a hand crank |83 and a dial |84 which is driven
65 having a radial slot in which a pin 66 is posi
tioned at the intersection of slots in the com
with the position of component slide 64 by gears
11 and arack 18 on the slide 64.
60
by a worm |85.
The parallax angle (PG) is obtained from a
cam mechanism |86 the inputs to which are the
shafts 84 and 89 the rotations of which repre
slide block 88 on which the pin 66 is mounted.
sent the distance RI and the angle GI respec
The screw 19 is driven by gears 8|, shaft 82, dif
tively. The cam mechanism |86 is in all respects
ferential 83, and shaft 84 which is connected to 85 the same as cam mechanism 98 except that the
the motor 61. The motor 68 rotates the gear 65
cam is so shaped that the output drives shaft |01
through shafting B5 and gears 86. The shafting
in accordance with the angle PG. The rotation
85 also connects to one member of differential
of shaft |81 combines in differential |88 with the
83 which thereby acts as a compensating differ
rotation of shaft 89, which represents the angle
ential -so that the rotation of the vector gear 65
GI, to rotate the shaft |89 in accordance with
does not alter the relative rotation of the screw
the gyro angle (G2) as may be seen from Equa
19 and the shaft |34.v The counter 81 driven by
tion 7.
.
shaft 84 therefore represents the length of the
It will be seen from Fig. 1 that the direction of
The motor 61 positions the pin 66 radially of
the gear 65 by a, screw 19 threaded through a
vector or the distance RI. The shafting 85, the
the straight portion of travel of the real torpedo
rotation of -which represents the angle DT, is u relative to the bearing line ob is equal to the sum
2,403,505
7
of the angles DT and PG. Shaft I Ill (see Fig.
2) is rotated in accordance with this sum by the
differential III which is connected to shafting
85 and shaft IIl'I, the rotations of which represent
the angles DT and PG respectively. Shaft I I0 is
connected to ring dial I I 2 surrounding target dial
ues represented by the position of the input ele
ments, second multiplying means including an
input element operable in accordance with the
movement of the second component member, a
22 and ring dial 20.
member representing the product of the values
The arrow II3 on the dial
second input element settable in accordance with
the time of run of the torpedo, and an output
represented by the position of the input elements,
II2 when read relative to the bow of the target
means settable in accordance with the present
image on dial 22 indicates the angle of impact
(AG) of the torpedo. The position of the arrow 10 range to the target, and a vector solver includ
ing a component member settable in accordance
II3 relative to the ñxed index 23 represents the
With the output of the first mentioned multiply
direction of the torpedo course relative to the
ing means, a second component member settable
bearing line ob which angle is equal to the sum
in accordance with the combined movement of
of the angles DT and PG.
When the time of run is relatively long it is 15 the output of the second multiplier and the range
settable means and a vector member operably
known that, except at the equator, the rotation
of the earth has an appreciable effect on the di
associated with said component members and
rection of the spin axis of an azimuth gyroscope
adjusted thereby to determine the distance to the
point of intercept of the torpedo and target and
such as used to guide a torpedo. This effect is
expressed by the equation
the direction of the course of the torpedo relative
to the line of sight.
t-sin L
2. Apparatus for luse in determining the course
(12)
to be given to torpedoes, comprising means for
in which PL represents the correction in minutes
determining the direction of the line of sight to
of arc to be applied to the gyroscope, t is the time l25 a moving target, a component solver including
of run in seconds and L is the latitude at which
a vector element adjustable in accordance with
the run occurs.
the target speed and the target »course relative to
This correction for latitude as it is commonly
the line of sight, a component member repre
called is computed by the multiplier I I4 the inputs
senting the component of target course and speed
of which are time of run (t) as represented by 30 at right angles to the line of sight and a second
the rotation of shaft 50 and the sine of the lati
component member representing the component
tude as represented by the rotation of a shaft I I5
of target course and speed along the line of sight,
which is set by a hand crank IIS and a dial II'I
multiplying means including an input element
which is driven by Worm II8 on shaft H5. The
operable in accordance with the movement of
dial l I'I is graduated in terms of latitude so spaced 35 the first mentioned component member, a second
that the rotation of shaft I I5 represents the sine
input element settable in accordance with the
of the latitude set on the dial.
time of run of the torpedo, and an output mem
The output of the multiplier II4 rotates shaft
-ber representing the product of the values repre
II9 in accordance with the latitude correction as
sented by the position of the input elements, sec
expressed -in Equation l2. The latitude cor 40 ond multiplying means including an input element
rection, represented by the rotation of shaft IIS,
operable in accordance with the movement of
is combined with the uncorrected gyro angle (G2)
the second component member, a second input
represented by the rotation of shaft |09, in dif
element settable in accordance with the time of
ferential |20 to rotate shaft I 2l in accordance
run of the torpedo, and an output member repre
with the corrected gyro angle. The shaft I2I
senting the product of the values represented by
drives a dial |22 by means of a Worm I 23. The
the position of the input elements, means settable
dial |22 is graduated in terms of gyro angle. A
in accordance with the present range to the
transmitter |24 is driven by shaft I2I to transmit
target, a vector solver including a component
the gyro angle to a receiver unit (not shown) at
member settable in accordance with the output
50
the torpedo discharge station for use in setting
of the first mentioned multiplying means, a sec
the gyroscope angle of the torpedo.
ond component member settable in accordance
It will be understood of course that While one
with the combined movement of the output of the
specific embodiment of the invention has been
second multiplier and the range settable means
described, various changes and modifications may
and a vector member operably associated with
be made therein without departing from the 55 said component members and adjusted thereby to
spirit and scope of the invention.
determine the distance to the point of intercept
Having described my invention, what I claim
of the torpedo and target and the direction of
and desire to secure by Letters Patent is:
the course of the torpedo relative to the line of
1. Apparatus for use in determining the course
sight, means settable in accordance with the
to be given to torpedoes, comprising means for
torpedo speed, and dividing means including an
determining the direction of the line of sight to
input element operable in accordance with the
a moving target, a component solver including
distance to the point of intercept as determined
a vector element adjustable in accordance with
by the vector member, a second input element
the target speed and the target course relative
operable in accordance With the torpedo speed
to the line of sight, a component member repre- '
settable means and an output member represent
senting the component of target course and
speed at right angles to the line of sight and a
second component member representing the com
ponent of target course and speed along the line
of sight, multiplying means including an input‘
element operable in accordance with the move
ment of the first mentioned componentl member,
a second input element settable in accordance
ing the quotient of the values represented by the
position of the input elements, said quotient rep
resenting the time of run of the torpedo.
with the time of run of the torpedo, and an out
3. Apparatus for use in determining the gyro
angle relative to the centerline of a torpedo tube
for discharging torpedoes having a course con
sisting of a curved section and a straight section,
directing means for determining the direction of
the line of sight to a moving target relative to the
put 4member representingthe product of the val-f"
centerline of the tube, means for determining 'the
enum/y
teach tice
@lieg
2,403,505
component at right angles to the line of sight of
the movement of the target during the time of
run of the torpedo, means for determining the
component along the line of sight of the movement
of the target during the time of run of the torpedo,
said component determining means including
means adjustable in accordance with the time of
run of the torpedo, means settable in accordance
with the range to the target along the line of
sight, a Vector solver including component mem
bers operable in accordance with the component
determining means and the range settable means
and a Vector member operably associated with
10
of the movement of the target during the time of
run of the torpedo, means for determining the
component along the line of sight of the move
ment of the target during the time of run of the
torpedo, said component determining means in
cluding means adjustable in accordance with the
time of run of the torpedo, means settable in
accordance with the range to the target along the
line of sight, a vector solver including component
members operable in accordance with the com
ponent determining means and the range settable '
means and a vector member operably associated
with said component members the direction and
length of which represent the direction relative
said component members the direction and length
of which represent the direction relative to the 15 to the line of sight and the distance to the point
of intercept of the torpedo and target, dii-feren
line of sight and the distance to the point of
tial means for combining the directional position
intercept of the torpedo and target, differential
of the directing means and the directional posi
means for combining the directional position of
tion of the vector member to determine the di
the directing means and the directional position
rection of the point of intercept relative to the
of the vector member to determine the direction
centerline of the tube, means settable by he differ
of the point of intercept relative to the centerline
ential means and in accordance with the length
of the tube, means settable by the differential
of the vector member for positioning an output
means and in accordance with the length of the
vector member for positioning an output mem
ber representative of a correction to the distance
to the point of intercept, means for combining
the positions of the output member and the length
of the vector member, dividing means including
an input element operable by the combining
member representative of a correction to the
distance to the point of intercept, means for
combining the positions of the output member
and the length of the vector member, dividing
means including an input element operable by the
combining means, a second input element oper
means, a second input element operable by a 30 able by a member settable in accordance with
member settable in accordance with the torpedo
speed and an output element positioned thereby
in accordance with the time of run of the torpedo,
the torpedo speed and an output element posi
tioned thereby in accordance with the time of
run of the torpedo, means for adjusting the said
time of run means in accordance with the posi
means for adjusting the said time of run means
in accordance with the position of the output 35 tion of the output element, means settable by the
diiïerential means and in accordance with the
element, means settable by the differential means
length
of the vector member for displacing a part
and in accordance with the length of the vector
in
accordance
with the correctional angle to allow
member for displacing a part in accordance with
for the curved section of the torpedo path, sec
the correctional angle to allow for the curved 40 ond diñerential means for combining the output
section of the torpedo path and second differen
of the first differential means and the displace
tial means for combining the output of the ñrst
ment of the part to determine the direction of the
differential means and the displacement of the
straight section of the torpedo path relative to
part to determine the direction of the straight
the centerline of the torpedo tube, multiplying
section of the torpedo path relative to the cen 45 means settable in accordance with the time of
terline of the torpedo tube.
run of the torpedo and the sine of the latitude
4. Apparatus for use in determining the gyro
for positioning an output member in accordance
angle relative to the centerline of a torpedo tube
with a correctional factor to correct for the effect
for discharging torpedoes having a course con
of rotation of the earth upon ythe path of the
sisting of a curved section and a straight section, 50 torpedo and means for modifying the determined
directing means for determining the direction of
direction of the straight section of the torpedo
the line of sight to a moving target relative to
path in accordance with the position of said out
the centerline of the tube, means for determining
the component at right angles to the line of sight
put member.
RAYMOND E. CROOKE.
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