Popular Science Monthly 



Shutter 

 release 



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This Airplane-Camera Takes 750 

 Exposures with One Loading 



THE greatest work of the airplane is to 

 locate the enemy's strongholds and 

 batteries and then map them. 

 The multiple airplane-camera 

 which the Allies are using — an 

 American invention, by the 

 way-^-can map the 

 German lines with 

 truly marvelous pro- 

 ficiency. Where, 

 in the first part 

 of the war, artist- 

 observers were 

 used to make pencil 

 sketches as accu- 

 rately and as quick- 

 ly as they could, 

 now cameras such 

 as this one are em- 

 ployed to take 

 thousands of pho- 

 tographs at the rate of one a 

 second, if necessary. 



One multiple airplane- 

 camera alone is capable of 

 seven hundred and fifty ex- 

 posures with a single loading. 

 The secret of this great 

 capacity lies in its use of 

 ordinary motion picture film. It is con- 

 structed much like the ordinary film 

 camera, with the exception that the turning 

 of the film for a new exposure is accom- 

 plished automatically by the action of a 

 set of gears. 



The camera is placed on 

 the airplane so that it will 

 have an unobstructed view 

 downward and slightly for- 

 ward. One pull on the flexi- 

 ble cable, connected with the 

 operating lever of the gears, 

 winds up the previously ex- 

 posed film, sets the shutter, 

 makes the new exposure, and 

 registers its number. A 

 spring instantly brings the 

 lever back into normal posi- 

 tion ready for the next pic- 

 ture. This happens so swift- 

 ly that it is possible to make 

 a continuous record of a 

 flight. In bomb-dropping 

 the camera is capable of tak- 

 ing pictures of the bomb in 

 the air and at the very in- 

 stant of explosion. 



lever 



The camera that takes 750 

 exposures with one loading 



The Electric Stevedore. It Saved 

 $18,000 in Labor Costs in a Year 



BELOW is pictured an electric floor- 

 truck that does the work of ten man- 

 propelled trucks. The pull- 

 ing effort of the single front 

 power-wheel is such that a 

 railroad flat car weighing 

 33,900 pounds is hauled over 

 sandy soil, carrying several 

 interested observers. 



The truck is the in- 

 SHj vention of J. E. Haschke, 

 of Los Angeles, the man 

 at the wheel. 



The truck weighs but 

 1500 pound;?. The mo- 

 tor is mounted on the 

 yoke of a caster wheel, 

 which permits the truck 

 to revolve within its 

 own wheel base; hence 

 its peculiar usefulness 

 upon congested floors. 

 The wheels are rubber- 

 tired. 

 A striking feature is em- 

 braced in the two levels of 

 the truck, one but twelve 

 inches from the floor. Any 

 level of platform desired or 

 demanded by warehouse needs can be 

 provided. The truck will carry a ton on 

 its back and tow several tons more on 

 trailers; or it will carry several tons of iron, 

 for instance, at a time over good streets. 



PiYdE 



It would take ten man-oper- 

 ated hand trucks to do the 

 work of this electric truck 



