APPENDIX B. 



ANIMAL LOCOMOTION. 



DESCRIPTION OF THE PLATES. 



The results of the investigation executed for the Uni- 

 versity of Pennsylvania are 



SEVEN HUNDRED AND EIGHTY-ONE SHEETS OF ILLUS- 

 TRATIONS, 



containing more than 20,000 figures of men, women, and 

 children, animals and birds, actively engaged in walking, 

 galloping, flying, working, jumping, fighting, dancing, 

 playing at base-ball, cricket, and other athletic games, or 

 other actions incidental to every-day life, which illustrate 

 motion or the play of muscles. 



These sheets of illustrations are conventionally called 

 ''plates." 



EACH PLATE IS COMPLETE IN ITSELF WITHOUT REFERENCE 

 TO ANY OTHER PLATE, 



and illustrates the successive phases of a single action, 

 photographed with automatic electro-photographic ap- 

 paratus at regulated and accurately recorded intervals of 

 time, consecutively from one point of view; or, consecutively 

 AND synchronously from tvio^ or from three points of view. 

 A series of twelve consecutive exposures, from each of 

 the three points of view, are represented by an outline 

 tracing on a small scale of plate 579, a complete stride of 

 a horse walking; the intervals of exposures are recorded 

 as being one hundred and twenty-six one-thousandths of 



a second. 



1 



