HISTORY OP CHRONOPHOTOURAPHY. 



321 



black hole faring the first.] In order to approximate 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 obtained upon an unclouded background; 



Fig. 6. 



No. 5. Figures hi relief obtained by the use <>f clironojyhotograjyhy. — 

 A single apparatus only 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 



backgrounds perpendicularly to one another (fig. 6), the animal repre- 

 sented will be seen from three different 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 

 8M 1901 21 



