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Патент USA US2411425

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Nov. 19, 1946.
2,411,425
F. H. HAGNER
OBSERVATION AND ANGLE-DETERMINING INSTRUMENT
Filed Dec. 5, 1940
2 Sheets-Sheet l
NOV. 19, 1946.
F_ H_ HAGNER
2,411,425
OBSERVATION AND ANGLE-DETERMINING INSTRUMENT
Filed Dec. 5, 1940
2 Sheets-Sheet 2
3 wuc/wbo’b
FREDERICK H. HA G/VE/i’
Patented Nov. 19, 1946
2,411,425
UNITED STATES PATENT OFFICE
2,411,425
OBSERVATION AND AN GLE-DETERMINING
INSTRUMENT
Frederick H. Hagner, San Antonio, Tex., assignor
to Arohbold-Hagner Instrument Laboratory,
Inc., a corporation of Delaware
Application December 5, 1940, Serial No. 368,698
10 Claims.
1
.
(01. 33—-206)
2
of a hollow tube suspended in threaded engage
ment with a head H. An observation tube 12
is carried by the upper end of the head II and
extends at right angles to the handle I0, the
handle normally extending substantially in a
tion, the angular position of a ship, plane and
vertical position and the observation tube l2 nor
the like, at a given time with respect to a hori
mally extending in a horizontal position. A stop
zontal or vertical plane.
'
Watch may be carried by the observation tube l l
A further object of this invention is the produc
to record the exact time at which the observation
tion of a. simple and efficient means for record
ing the angular position of a plane, ship and the 10 is being made.
This invention relates to an observation and
angle-determining instrument, and has for one
of its objects the production of a simple and efli
cient means for determining, by direct observa
like, at a given time relative to a horizontal or
vertical plane, whereby the readings while taking
observations of celestial bodies and the like, by
direct observation may be conveniently checked
with the record of the angular position of the
observation instrument at the time of observa
tion to more accurately obtain a proper calcula
tion as to an observer’s position with respect to
the body being observed.
The observation tube ll preferably comprises
an elongated tubular member having an eye
piece [4 at its inner end, which eye-piece sup
ports a plain glass panel l5. A light-varying
segment [6 is pivotally secured, as at IT, within
the eye cap l4, and is provided with a knurled
?nger-engaging portion 18 at its upper end to
facilitate the swinging of the light-varying seg
ment IS. The light-varying segment l6 prefer
A still further object of this invention is the 20 ably is provided with three light openings i9,
20 and 2|, arranged on an arc with respect to
production of a simple and e?icient recording
means for providing a permanent record of the
the pivot I? so as to be swung across the center
angular position of the device with respect to
of the glass panel l5. The light opening I9 may
be a clear opening, the light opening 20 a shaded
time,~thereby recording the angle of tilt of the 25 opening, and the opening 2| a shaded opening
with a clear small center opening 22. In this
instrument in all directions, away from the true
way, the light-varying segment it maybe swung
vertical, while making an observation.
to a position over the center of the panel [5 to
Qther objects and advantages of the present
the vertical and horizontal planes, at a given
correspond with the intensity of the light which
inventionwill appear throughout the following
speci?cation and claims.
30 is being viewed through the observation tube II.
In the drawings:
Figure 1 is a side elevational view of the obser
vation and angle-determining instrument;
Figure 2 is a rear elevational view thereof;
The outer end of the observation tube H is
provided with a glass panel 23 having a luminous
spot 24 formed in the exact center thereof, this
luminous spot being of transparent luminous
Figure 3 is a vertical sectional view, certain 35 material, so that at night when a star is sighted
parts being shown in elevation;
through the observation tube H the brilliancy of
. Figure 4 is a vertical section taken on line 4-4
of Figure 3;
>
the star may be viewed through the transparent
spot to enable an observer to place the spot in a
Figure 5 is a vertical sectional view taken on
line 5—5 of Figure 3;
' Figure 6 is a fragmentary side elevational view
of the micrometer release;
Figure '7 is a vertical sectional view taken on
line '|—‘l'of Figure 1;
dead-center with respect to the object being
40 viewed, such as a star of a smaller relative size.
-
When viewing larger objects the luminous spot
will facilitate the placing of the spot in the exact
center ‘of the object being viewed, for instance
as when viewing the sun which is a 32-minutes
Figure 8 is an end elevational view looking at 45 are the luminous spot or dot has a dimension
with respect to the celestial body of a 20-minutes
the outer end of the observation tube;
Figure 9 is a top plan view of the glass or trans
arc, In this way an observer may determine
parent. plate which supports the recording strip
whether or not the spot is toward the edge of the
of paper and illustrating a fragment of the re
arc of the sun or is in the dead-center. The ob
cording strip of- paper;~
50 server also in this Way may utilize the optics of
the eye to replace the usual lenses which are em
Figure _10 is a front. elevational view of the
transparent plate or glass carried by the obser
ployed in many instruments of this character.
vation tube near the outer end thereof.
A graduated quadrant 25 is hung from the ob
By referring to the drawings it will be seen that
servation tube in the manner shown and this
It! designates handle which may ‘be in the nature 55 quadrant is provided with rack teeth 26 upon its
2,411,425
4
periphery which teeth are adapted to be engaged
magnet 38 is mounted for bodily sliding longi
by a suitable micrometer screw 21, this screw
being so adjusted as illustrated in dotted lines
in Figure 6 to permit the release of the screw
from the rack teeth 23 by compressing the trigger
28. Any well-known type of means may be
utilized for this purpose to permit the micrometer
screw 2? to be properly adjusted by rotating the
knob 29 or to permit the hanger frame 36 to be
tudinal movement withrespect to the casing or
housing 33, in a direction away from the missile
to release the missile.
V
A ball-guiding tube 45 is carried by the hous
ing 33 and extends to a point adjacent the lower
end of the channel 39. A rotating valve 46 is
carried near one end of the tube 45 and commu
nicates with a spring-pressed ball-carrying mag
freely swung when the trigger 28 is compressed 10 azine 3'! extending vertically of the housing 33
to release the screw 27 from the rack teeth 25. .
in a manner as shown in Figure 3. Balls 58 are
The quadrant 25 as above stated, is hung from
carried within the magazine 41 and are carried
the observation tube and is also hung upon the
to the valve 46. This valve 46 is rotated bymeans
shaft 35 which extends transversely throughthe
of'a trigger 49, the valve 43 having an open side
head II. This quadrant is ?xed at its lower end 1.5 for receiving theballs 48. As the trigger 49 is
in any suitable manner to the handle it to hold
depressed and the valve 43 rotates the open side
the quadrant 25 in anchored relation with re
of ‘the valve 45 Will be brought into registration
spect to the handle “I.
with the end of the tube 45, and the ball will
be fed down through the tube 35 to a position to
contact with the lower end 50 of the depending
tube 5!. Before rotating the valve 46, however,
a supporting element 52 which is journaled, as
at 53, is swung from the position shown in full
lines to the position shown in dotted lines in
Figure 3 by depressing the trigger 54. The sup
porting element 52 when in the position shown in
dotted lines will prevent the ball when contacting
with the lower end 50 0f the tube 5! from drop
ping momentarily until the ball is acted upon by
the magnetic force of the magnet 38 and ?rmly
held in position thereby. The trigger 34 is then
released and the supporting element 52 drops to
the position shown in full lines.
The magazine a‘! may be of a conventional type
but is preferably held in threaded engagement
v
V
The hanger 33 is journaled for free swinging
movement upon the shaft 31 and is held in slid
20
able engagement with the quadrant 25, as shown
in Figure 3, and may be connected thereto in any
convenient or desired manner; The micrometer
screw 2‘! is also anchored in engagement with
the hanger 39 in the manner shown or in any 25
other suitable manner so as to permit the screw
2'!‘ to contact with the rack teeth 23 or to be
moved out of engagement with these rack teeth
' by compressing the trigger 28.
The shaft 31 carries a ball-bearing journa1'32 30
adjacent the hanger 3B and a ball-dropping hous
ing or casing 33 is journaled upon the ball-bear
ing journal 32, as indicated at 313, for constitut
ing a bearing journal. A brake mechanism com
prising the shaft 3l is employed, which shaft 3| 35
is movable longitudinally by means of a cam
with the lower end 33a of the housing 33 as
trigger 35'Which when swung to the position
shown. A channel 55 leads from the lower end
shown in Figure 3 will lock the brake shoe 36
of the bore 3‘? to a point near the lower end 33a
againstwthe outer end of the bearing section 32a
of the housing 33 to provide a pocket to permit
of the bearing journal '32 and hold the journal 40 accumulated balls within the bore 31 to pass to
portion as against rotating movement, and there
a position where the balls may be placed within
by lock the ball-carrying housing against swing
the magazine (ii. The magazine 47 may be with
ing movement when desired.
drawn from the housing 33 to receive the balls
The ball-dropping housing 33 is carried by the
journal 33 as shown, and the trigger 35 may be
swung to the position shown in dotted lines to
release the brake shoe 36 and permit the housing
33 to freely swing in a pendulum-like manner to-v
gether with the hanger 39.
The ball-dropping housing 33 is provided with
a vertical bore 3'l'the, upper end of which car
ries an Alnico magnet 38 which is in the nature
of magnetized metal and is of any desired or
usual'shape, and is slidably mounted within the
channel, 39 carried by the cap 40 of the ball
di'opping housing 33. This magnet 38 is con
nected to a bell crank lever 4!, which bell crank
lever M is actuated by a cam 42 the cam being
carried by‘ a shaft 43 and in turn being operated
by a spring-pressed trigger 43 carried by the han
dle it as shown in Figure 5.’ Consequently, by
compressing the trigger 44 the shaft 453 will be
within the channel 35 and may then be replaced
to the position shown in Figure 3 for feeding
the balls4~8 to a point where they may be en
gaged individually at selective intervals by the
magnetic force of the magnet 38’.
A glass plate 53 is supported ‘at the bottom of
the bore 31 and is engaged by the upper end of‘
a viewing tube 57, which tube extends up into
the socket 558 of the housing 33. Paper reels 59
are rotatably mountedwithin the housing 33 upon ‘
opposite sides of the socket '58 so as to causes.
strip of paper 69 to be reeled over the glass plate
56 at the upper end of‘ the viewing tube 57. A
suitable knurled knob 3'! may be employed for
operating the reel or reels 59. A hinged ribbon
carrying plate 62 is hingedly secured, as at 63,,v
near one side of the bore 31 adjacent the plate
56 and is adapted to be swung down over the
panel 56 and paper 60 from; the position shown
rotated in turn rotating the cam 42 swinging the
in full lines in Figure 3 in the direction of the
bell crank lever 4-1 and lifting the magnet 38
arrow, and a suitable knob 34 is utilized for this
bodily in a vertical direction in a manner for 65 purpose. This, ribbon-carrying plate 32 carries a
the’ purpose hereinafter described.
suitable strip of inked ribbon 62a and when the
‘t will be noted that the casing or ball-drop
ribbon 62a is drawn in contact with the strip of
ping housing 33 has a pronounced longitudinal
extent and that; the retractible missile-support
ing means or magnet 38 is longer than it is wide.
This magnet 33 is carried near one end of the
casing or housing 33, as-shown in Figure 3. A
paper 63, ‘a ball dropping thereon. will cause an
impression to be made on the‘ strip of paper. The
housing 33 is provided with a window upon one
side and a hinged window 63 on the opposite side.
The hinged window 66 maybe swung upwardly
to permit an operatorv to place a suitable mark
is‘ rcleasably- held by the missile-supporting means
across the strip of paper 60 at‘the center- of the
ormagnet 38. The missile-supporting means or 75 viewing tube 51 to-pr-ovide a gauge. The viewing
free-falling missile, such as one of the balls 48,
2,411,425
tube 51 is slidably mounted through a guide 61
anchored upon the lower end of the hanger 30
and this viewing tube 51 is vertically slidably
withdrawn from the housing 33 permitting the
housing 33 to freely swing in a pendulum-like
manner through the force of gravity. The balls
48 by dropping through the housing 33 will record
the angle of swing and the hanger 30 may then
be swung to this angle and locked in position
mounted through the guide 61 so that the upper
end of the tube 5'! may be moved into and out
of the socket 58 to hold the housing 33 in proper
alignment with the viewing tube 51.
to obtain a proper reading upon the quadrant
25 and the relative markings upon the strip of
It, should be understood that any suitable or
paper at may be viewed through the medium of
desired type of means may be employed for rais
ing the magnetized element or magnet 38 to with 10 the viewing tube 51.
Attention is called to the fact that in Figure 1
draw the magnetic force away from the ball 50
the housing 33 is swung away from the viewing
and that any desired type of trigger arrangement
tube 5'! for the purpose of showing the parts
may be utilized for this purpose without depart
of the device and to emphasize the fact that this
ing from the spirit of the invention.
When taking an observation, the operator will 15 housing 33 may swing upon its journal inde
pendent of the hanger 38 and the housing 33
view an object through the observation tube H
being also adapted to swing upon the shaft 3|
in a manner to cause the spot 24 to center upon
when the housing 33 is secured in the position
the center of the object as accurately as possible
shown in Figure 3.
and when the proper sight is taken the trigger
The observation tube carries a transparent
44 is compressed bodily moving the magnet 38
plate or glass panel 23a as shown in Figure 1,
upwardly and urge the magnetic force away
and this transparent plate or glass panel 23a
from the ball supported thereby, thereby releas
ing the ball and permitting the ball to drop as
has crossed etched lines 23b formed thereon to
facilitate the alignment of the junction of these
a free-falling mass upon the strip of ribbon 6211,
which will cause a mark to be impressed upon the 25 crossed lines with the luminous spot carried by
the transparent plate or glass panel 23.
strip of paper 61! directly thereunder. By op
The glass panel or plate 55 is preferably pro
erating the triggers 54 and 49 the valve .46 will
vided with a pair of spaced transverse etched
be opened and the supporting element 52 moved
lines 532' and a central crossed line 56b. The
to a proper position to feed an additional ball
48 to a proper point, below the lower end of the 30 recording strip 60 is provided at spaced intervals
tube 5! where the ball will be suspended by
magnetic force by the magnet 38. The support
ing element 52 is then dropped to the position
with transverse short lines which are adapted
to register with a similar line carried by the
panel or plate 55. The dots in Figure 9 indicate
the markings from the ball 48 upon the record
shown in full lines in Figure 3. A second read
ing may then be taken and a second ball dropped 35 strip 58. The operator may reach in through the
window 65 and write on the strip ‘58 a suitable
to make a further impression upon the paper.
memorandum as to time, or make other notations
In this way, a number of readings may betaken
if desired.
_
in a manner similar to that described in my
As shown in Figure 4, the housing 33 may be
previous Patent #2,219,990 issued October 29,
provided with a closure plate 33b adjacent the
1940, and relating to an angle determining device.
strip 60 to permit access to the strip 60 for re
It should be understood that the magnet in the
placement and access to the reels 59 by the re
present instance constitutes a piece of highly
moval of the plate 33”.
magnetized material which will retain its magne
tism over a maximum period of time, and that the
The micrometer screw and Vernier 29 is pro
ball is released by bodily moving the magnet to a
vided with a rotatable band 29a which may be
position whereby the magnetic force will be weak
set independent of the Vernier and locked in
ened with respect to the ball and will permit the
position by manipulating the member 29 so that
ball to drop by force of gravity to impress a mark
the amount of turn of the Vernier or micrometer
upon the strip of paper 63 to obtain a reading
screw may be observed after the setting for a
of angle variance with respect to the vertical
comparison with the other readings of the instru
ment.
and horizontal planes. If the instrument is held
in a true vertical, the ball which is dropped within
The instrument above described constitutes a
the housing 33 will strike the center of the record
recording and averaging sextant and provides a
ing unit or recording means, but if the instru
very light instrument for recording the altitude
ment is tilted at an angle to either side of the
of celestial bodies by employing a ball-dropping
line of vision of the object observed, the impact
device in the nature of a missile and a means
of the ball when dropped upon the recording
for averaging the groups of dots on the recording
means during observation will record the angle of
strip or tape 60 and this instrument embodies
tilt. The degree of this angle of tilt must be
an observation tube I l, the recording mechanism
computed and subtracted from the altitude angle 60 and housing 33, the altitude quadrant or are 25
and the viewing or averaging unit 51.
T
which is measured on the instrument to deter
mine the true angle of the object observed, meas
The observation tube I! is preferably con
ured from the true vertical or horizontal plane.
structed of a light material such as Dural having
It should be understood that means may be
an overall length preferably eight inches, and a
provided if desired to automatically and periodi
diameter of one and one-fourth inches. The eye
cally drop a series of balls one after another
can or piece [4 consists of a small peep-hole de
upon the recording means to give a reading of
scribed above. The transparent panel or glass
23a has etched or engraved crossed lines 23b and
an average angle. This mechanism may em
is placed in the tube l l preferably ?ve inches
body a timing device for releasing these balls
one at a time over a selected period of time and 70 from the peep-hole. The glass or transparent
panel 23 at the outer end of the tube H has the
may be set in motion by pulling the trigger 44
exact center thereof etched to provide a one
or by any other means such as electrical release
sixteenth of an inch circle which is ?lled with
means.
luminous paint one-thirty-second of an inch
It should be understood that in timing the
observation, the viewing tube 51 is released or 75 thick. The yellow glare from this luminous paint
Q3151 1,4125
7
8
permitsa‘star or planet (such as the moon and
the‘l'il'se) to be centered thereon, This then be
comes the horizon or reference line. The eye-cap
posite-‘enact the casing, means for bodily moving
the magnetie element away- from the 'mis'sile‘for
' releasingithefinis‘sile andvcausihg the missile to
or piece [4 near the eye is provided‘ with a means
may fall by-force of gravity and strike said re
for varying the size of the opening to provide a
cording means, and means for feeding a missile
sun-shade, and the like. It should be borne in
to a point within the magnetic ?eld of the mag;
mind-that the ‘present device provides a very e?i
netic element to cause the missile to lie-mag‘
netieally suspended within the magnetic ?eld.
cient-structure wherein themissile or ball 48 may
be released by simply pulling the trigger L34 there
4, An angle-recording device of the class de-'
by avoiding dislocation or change of the position of 10 scribed ‘comprising a casing, a magnetic element
the instrument to produce the desired record.
mounted for bodily movement and carried by‘ the
When using the device, the eye-piece I4 is
casing, a free-falling, missile adapted to be suse
placed near the eye of the observer and the brake
pended in one end ofthe casing by the magnetic
36 is; released through the medium of the mem
element, a recording device carried near the op‘
ber'35 to permit the recording mechanism to 15 posite end of the casing, means for bodily moving
swing in a pendulum-like manner to a substan
the magnetic element away from the missile for
tially vertical position. A ‘ball is fed to a proper
releasing the missile and causing the missile to
position as described above to be suspended by
freely fall by force of gravity and strike said re
the magnet 38 and when the horizon line or ref
cording means, means for feeding a missile to a
erence line registers with the body being observed, 20 point within the magnetic ?eld of the magnetic
the trigger 44 is operated releasing the ball 138
element to cause the missile to be magnetically
which will drop upon the ribbon ‘section 62*1 and
suspended within the magnetic ?eld, a missile res
make a record upon the strip ?ll, to provide a per
ervoir, and valve means for releasing the missiles
manent record of contact. This may be repeated
one-by-one to be fed to the magnetic element.
for ten'shots to obtain an average.
5. An angle-recording device of the class de
25
The averaging device is moved to a position
scribed comprising a casing, a magnetic element
directly over the viewing tube 51 to obtain a read
ing of the ten shots above mentioned, recorded
on the strip of paper 6i}. This viewing tube 57
may be provided with a suitable magnifying lens.
The‘ 'm'icrometer screw 27 is moved until the
etched line is in the center of the group of dots——
then read the arc for’the. degrees and the microm
eter screw drum forlthe minutes. This gives the
altitude reading.
_
V
p
The "instrument illustrated and described in
this application is adapted to be used in substan
mounted for bodily movement and carried by the
casing, a free-falling missile adapted to be sus
pended in one end of the casing by the magnetic
element, a recording device carried near the op
posite end of the casing, means for bodily mov»
ing the magnetic element away from the missile
for releasing the missile and causing the missile
to freely fall by force of gravity and strike said re-‘
cording means, means for feeding‘ a missile to a
point within the magnetic ?eld of the magnetic
element to cause the missile to be magnetically
suspended within the magnetic ?eld, a missile res
ent instrument is constructed in such a manner
ervoir, valve means for releasing the missiles one
as to measure an angle within an arc of 90°. 40 by-one to be fed to the magnetic element, and a
spring-pressed magazine ?tting in the reservoir.
This instrument may be, if so desired, attached to
a sextant or octant in any conventional manner
6. An angle-recordingrdevice of the class de
tially the same manner as a sextant, but the pres
for the purpose of furnishing an arti?cial horizon,
from which an angle of elevation may be meas
ured.
’
,
fHaving‘ described the invention what I claim as
new
is:
p
’
'
M
V
V
_
' ,1.‘ An angle-recording deviceof the class de
scribed comprising a casing, a magnetic element
mounted for bodily movement and carried by the
‘r casing, a free-falling missile adapted to be sus
pended in one end of the casing by the magnetic
element, a recording device carried near the op
posite end of the casing, means for bodily mov
scribed comprisinga casing, a magnetic element
ing the magnetic element away from the missile
mounted for bodily movement and carried by the
casing, ,a free-falling missile adapted to be sus
to freely fall by force of gravity and strike said
pended inbne end of the casing by the mag
netic element, a recording device carried, near
for releasing’ the missile and causing the‘missile
recording‘ means, means for feeding a missile to
a point within the. magnetic ?eld of the magnetic
element to cause the missile to be magnetically
the opposite end of the casing’, and means for
bodily moving the ‘magnetic element away from
the missile for releasing thefmissile and causing
the missile to freely fall by force of gravity‘ and
suspended within the magnetic ?eld, a missile res
ervoir, valve means for releasing the missiles one
by-on'e' to beufed tothe magnetic element, and av
strike said recording,‘ means.
trigger for operating the valve means.
_ '2.
'
V
.
angle-recordingdevice of’ the class de
7. An angle-recording device of the class dee
scribed comprising’ acasing, a magnetic element 601 scribed comprising a casing, a magnetic element
mounted for bodily movement and‘ carried by the
mounted for bodily movement and carried by the
casing, a ‘free-falling ‘missile adapted to be sus
casing‘, afree-falling' ‘missile adapted to be suspended in one end of the casing by the magnetic
pended in one end- ofthe casing by the magnetic
element, a recording devicegcarried" near the‘op
element, a recording device carried near the op
positevend of the casing,v a trigger‘m'echanism for .. posite end of the" casing‘, means for bodily moving
bodily moving the magneticelement away from
the magnetic el'e'n‘ient away from the missile far
the missile for releasing'the missile and causing releasing the missile and causing‘ the missile to
the missile to iallpfreely by force of gravity and
strike said recording means.
,
_
3. An angle-recording device of the class de
scribed comprising av casing, a magnetic element
mounted‘ for bodily movement and‘ carried‘ by the
casing; a‘free-fall'ing" missileadapted to" be s‘us'e
freely fall by force‘ of gravity and strike said re
cording means,l means for feeding a missile to a
point within the magnetic ?eld of the magnetic
element'to cause the’ missile ‘to be magnetically
suspended within the magnetic ?eld, a missile
reservoir, valve means for releasing the missiles
one-by-one to be'fed to the magnetic element, and
pended in'o‘ne end of the‘ ‘casing by‘th'e magnetic
element, a" recordingdevice carried near the’ nip- 75 movable means movable to a position‘uiider the
2,41 1,425
10
magnetic element for supporting a missile while
it is being moved to a position within the magnetic
?eld of the magnetic element.
8. An angle-recording device of the class de
scribed comprising a casing, a magnetic element
held by said missile-supporting means, said mis
sile-supporting means mounted for bodily sliding
longitudinal movement with respect to said casing
in a direction away from the missile to release the
missile, a recording means carried near the op
mounted for bodily movement and carried by the
posite end of said casing, said missile being
casing, a free-falling missile adapted to be sus
adapted to impact with said recording means to
pended in one end of the casing by the magnetic
indicate the angle of incline and the angle of side
element, a recording device carried near the op
wise tilt of the casing during impact, means for
posite end of the casing, means for bodily moving 10 releasing the missile from ‘the supporting means,
the magnetic element away from the missile for
means for feeding a missile to the supporting
releasing the missile and causing the missile to
means, a missile reservoir, and means for releas
freely fall by force of gravity and strike said re
ing the missiles from the reservoir one by one to
cording means, means for feeding a missile to a
be fed to the supporting means.
point within the magnetic ?eld of the magnetic
10. An angle-recording device of the class de
element to cause the missile to be magnetically
scribed comprising a casing, a recording means
suspended within the magnetic ?eld, a missile
carried at one end of the casing, a reciprocating
reservoir, valve means for releasing the missiles
retractible missile-suspending element carried at
one-by-one to be fed to the magnetic element,
the opposite end of the casing, a free-falling mis~
and means forming a communication between the 20 sile adapted to be suspended by said suspending
reservoir and the casing for directing the missiles
element and also adapted to freely fall by force of
from the interior of the casing to the reservoir.
gravity and strike said recording means when the
9. An angle-recording device of the class de
missile is released, and means for bodily moving
scribed comprising a casing having a pronounced
said suspending element away from said missile
longitudinal extent, a retractible missile-support~ 25 and in a direction opposite to the direction of fall
ing means longer than it is wide, said retractible
of the missile for releasing said missile.
missile-supporting means carried near one end
of said casing, a free-falling missile releasably
FREDERICK H. HAGNER.
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