VI CELERITY PICTURED. 



I 



made in forty-two himdredtlis of a second, and each camera passed in 

 tbii-ty-eight thousandths of a second. 



It is difficult to conceive such rapidity in taking and recording the 

 representations, though any one who will take the trouble can 

 convince the most skeptical, by a mathematical demonstration, of its 

 truthfulness. The breaking of a thread opened and closed the 

 slide, so that the question is merely a simple rule-of-three proposi- 

 tion of : If an animal is covering 633 inches in a second, how long 

 will it take to pass over a space represented by a thread the 

 twentieth of an inch in thickness? The answer gives 12,660 in a 

 second of time, so that Mr. Muybridge's claim of a two-thousandth 

 part is far inside of the truth. 



As we progress in the consideration of the action, as disclosed by 

 the instantaneous photograph, it will be evident that this celerity 

 was absolutely essential, or the whole thing would be a confused 

 blur. 



The background of the cartoon shows a screen divided into a 

 number of vei'tical spaces twenty-seven inches apart, numbered from 

 one to seventeen, and four horizontal lines, the lower being the 

 ground surface, the others four inches apart. There is also another 

 horizontal line which marks about the height of the mare, nearly 

 touching her croup and withers when she is at rest. If the picture 

 at rest was taken at exactly the same distance- from the camera as 

 those when she was in motion, it will prove another new feature in 

 the stride of a race-horse, viz : the height which the body is thrown 

 when in the air. 



Number one of the series discloses the left fore foot on the ground 

 in advance of the line between the spaces five and six; the pastern 

 is bent so that the ankle nearly touches the gi'ound. The vertical 

 line is midway of the ankle joint, bisecting the body about four 

 inches back of the elbow, and, a» nearly as can be told, the mid- 

 dle of the saddle. The body of the rider is thrown forward 

 so that the upper part of his back is in advance of the line, 

 his head, even the back portion of it, being six inches in front. 

 The left fore leg is bent at the knee, the front part of the 

 knee being twelve inches from the ground, the heel of the upturned 



