US1107593A

US1107593A - Bullet for kinema-targets.

Info

Publication number: US1107593A
Application number: US82982714A
Authority: US
Inventors: Thomas Macready Down
Original assignee: Individual
Current assignee: Individual
Priority date: 1914-04-06
Filing date: 1914-04-06
Publication date: 1914-08-18
Anticipated expiration: 1931-08-18

Description

T. M. DOWN. BULLET FOR KINEMA TARGETS. APPLIbATION FILED APR. 6, 1914.

53 Patented Aug. 18, 1914.

. UNITED, STATES PATENT 0 m.

moms macansny DOWN, or Lennon, ENGLAND.

BULLET-FOR mainstream.

To all whom it may concern Be it known that I, THOMAS, MAcaEApY Down, subject of the King of Great Britain, residing at No. 25 Oxford street, London, England, have invented new and useful Improvements in Bullets for Kmema-Targets, of which the following is a specification.

This invention relates to means for mdicating hits made by bullets on kinematograph targets and its object is to provide a bullet which, while afi'ordlng an ind cation of the place struck on the target, w1ll not sully the surface of the screen which constitutes the target and upon which the lanemato aph picture is projected.

It as already been protposed to employ, for giving an indication o the place of 1mact on a. kinematograp'h target, the well Enown flash bullets,- such as are used for shooting game in the dark and which give a flash of light on impact. Now when ordinary explosive flash bullets are fired 'at a kinematograph target, the firing must be frequently. interrupted as such bullets soil the surface of the screen and after a limited number of bullets have been fired it becomes necessary to obliterate the marks made on'the screen b the bullets, as. these marks seriously inter ere with the definition of the moving .picture.

Accordin to the present lnvention, wh11e a bullet WhlCh gives a flash of light on impact is employed to indicate the spot on the screen hit by the bullet, the flashing substance with which the bullet is charged is of a nature to leave a deposit approximately of the same color as the screen, which latter consequently does not become sullied bythe impact of the bullets, and being a k1nematograph screen, is necessarily of a llght color. Although the flash may be of any color it is preferable to charge the bullets wlth a substance which gives a normally wh1te flash.

I A suitable flashing charge for the bullets, which gives a brilllant flash and leaves a white deposit, comprises a mixture of powderedaluminium or magnesium or an alloy thereof and a nitrate or chlorate, for in-' stance nitrate or chlorate of baryta. The composition found most suitable is :N1trate of baryta 8i parts, fine coal 8; part, aluminium 5 parts, and this produces a white flash and leaves a. white deposit.

As the flash alone is relied upon ind-1- cate a hit, it is obvious that the-pro ect1on Specification of Letters Patent.

Application filed. April 6,

Patented Aug. 18, 1914. 1914. Serial No. 829,827.

of the picture need not be interrupted by stopping the film.

The screen is constructed of iron or steel having a suitable surface for the presentation of the picture. i

The'accompanying drawing illustrates a bullet suitable for charging with a flashing composition, in which Figure 1 is a longitudinal section, and Fig. 2 a view of the front end of the bullet.

In these figures, a is the bullet which is hollow-nosed, bein formed with a. recess extending toward t e base and charged with flashing composition 6.

It has been found that a better flash is obtained when the flashing charge 6 does not extendquite to-the base of the recess in the bullet, but terminates short thereof leaving an air space c,'as shown.

. he flashing charge should be of a nature not to deteriorate when the bullets are kept charged for a reasonable period and is nondangerous in the sense of being liable to explode under the shock of firing. The latter feature renders the bullets available for being fired from pistols or revolvers.

The duration of the flash can be detained or prolonged, for example from 1/120 to 1/10 of a second.

The speed of the flash can be slowed by adding to most flash mixtures a negative catalyzing agent such as calcium plumbate, or a substance which serves on one hand to matogra-ph target screen, charged with a composition emitting a flash of light on impact of said bullet and leaving a deposit of the normal light color of said kinema-t0 graph target screen.

2. A .bullet for indicating hits on a kinematograph target screen, charged with a composition emitting a flash of light on impact of said bullet and leaving a white deposit.

increase the friction, and on the other to re- 1. A bullet for indicating hits on 'a kin'e- A bullet for indicating 'hits on a kinematograph target screen, char ed with a composition containing powdere aluminium and a small proportion of an oxidizing.

1'0 baryta.

5. A hollow nosed bullet for indicating hits on a kinematograph target screen, charged in said hollow nose with a composition emitting a flash of light on impact of said. bullet and leaving a deposit of the normal light color of said kinematograph target screen. I

6. A hollow nosed bullet for indicating hits on a kinematograph tar et screen, charged in said hollow nose wit a composition emitting a flash of li ht on impact of said bullet and leaving a .w ite dep0s1t.

7 A hollow nosedbullet for indicating hits on a kinematogra-ph target screen, charged in said hollow nose with a composition containing powdered aluminiulnand a small proportion of an oxidizing agent. i

8. A hollow n'os'edhullet for indicating hits on a kinematograph' target screen,

tion containing powdered aluminium and a small proportion of nitrate of baryta.

9. A hollow nosed bullet for indicating hits on a kinematograph targetscreen, v

charged in the outer portion of said hollow R. A. SM ITH," s-

nose withacomposition containing powdered H. D. JAM1soN-.. .3 'DISOLAIMETR.

oxidizing agent.

Disclaimer in Letters Patent No.1 ,107,593.

0 15613112 0 m September .18, 1.917.

.tion consisting approximately of pow charged in said hollow nose with aeomposiname to this specification in of two subscrbing witnesses.

aluminiumand a small proportion "of an oxidizing a. ent, and having an air space at the base 0 said hollow nose;

10..A" hollow nosed bullet for indicating hits on a kinematograph target screen,

charged in the outer portion of said hollow nose with a composition containing p'ow' dered aluminium and a small proportion of nitrate of baryta and having an an space at the base of said'hollow nose.

11. A bullet for indicating hits on a kine matograph target screen,- charged with a composition consisting 'approxnnatelyof wdered aluminium '5 parts, nitrate of aryta 8} parts and fine coal 1 part.

12. A hollow nosed bullet for indicating hits on a kinematograph target screen, charged in said hollow nose with a com osidered aluminium 5' parts, nitrate of baryta 8% parts and fine coal &' part. 1

13. A hollow nosed bullet for indicating hits on a kinematograph target screen, charged in the outer-port1on ofsaid hollow nose with a composition consisting approxi; mately of; powdered a-luminiumb parts, ni trate of baryta 81' parts and 'fine coal- -15 part and having arr-air space at 'the base of said hollow nose. 2 1

In testimony whereof I have signed the-presence -"M THOMAS MAGREADY DQWNi-J Witnessesz" 4..-

1,107,593. Thomas Macready Dow, London. England. BULLET FOR KINEMA- TARGETS. Patent dated 18, 1914; Disclaimer filed September 13,

1917, by the assignee, Winchester Repeating Arms 00. v Enters its disclaimer to claims. 3 and 7, which are in the following words: 7 3. A bullet for indicating hits on a kinematogr'aph target screen, charged with a composition containing powdered aluminium and a small proportion of an 7. A hollow nosed bullet for indicating hits on a kinematograph target screen, charged in said hollow nose acomposition. containing powdered aluminium and a small proportion of an oxidizing agent.