ARRANGEMENT OF APPARATUS 13 



tally for "Front Foreshortcnings," the points of 

 view averaging an angle of 60 degrees from the 

 lateral battery. 



O. The position of the operator; the electric bat- 

 teries; the chronograph for recording the intervals of 

 time between each successive exposure; the motor for 

 completing the successive electric circuits, and other 

 apparatus connected with the investigation. 



T T. The track parallel with the lateral battery 

 and covered with corrugated rubber flooring. 



M. The model, approaching the point number ' '1 " 

 on the track where the series of photographic illustra- 

 tions will commence. 



An estimate having been made of the interval of 

 time which will be required, between each photo- 

 graphic exposure, to illustrate the complete movement, 

 or that portion of the complete movement desired, the 

 apparatus is adjusted to complete a succession of elec- 

 tric circuits at each required interval of time, and the 

 motor is set in operation. When the series is to illus- 

 trate jpTogressive motion; upon the arrival of the model 

 at the point marked "1" on the track, the operator, 

 by pressing a button, completes an electric circuit, 

 which immediately throws into gearing a portion of 

 the apparatus hitherto at rest. By means of suitably 

 arranged connections, an electric current is transmitted 

 to each of the 3 cameras marked " 1 " in the various 

 batteries, and an exposure is simultaneously made on 

 each of the photographic plates, respectively, contained 

 therein. At the end of the predetermined interval of 

 time, a similar current is transmitted to each of the 

 cameras marked "2," and another exposure made on 



