HISTORY OF CHRONOPHOTOGRAPHY. 



321 



black hole farinj^ the first. | In oi-dcr to iippioxiniate to these ideal 

 conditions, the writer constructed a deep shed tapestried with black 

 velvet and facing- so that no light penetrated it. In that way very 

 sharp images are obtaincnl upon an unclouded backgiound. 



Fig. 6. 



No. 5. Figures in rchef (Mained hy the use of chronophofography. — 

 A single apparatus onl}^ gives the projection of the motions on a plane 

 perpendicular to the optical axis of the instrument. But if three 

 chronophotograph cameras are focused on dark fields or dead-black 



Fhj. 7. 



backgrounds perpendiculai'ly to one another (fig. 6), the animal repre- 

 sented will be seen from thrcH' diti'erent points of view, which will 

 enable us to understand its real attitudes by reference to the three 

 dimensions of space. Fig. 7 shows a series of bronze figures, united 

 SM 1901 21 



