Xll CONTENTS 



CHAPTER IX 



CERTAIN MOVEMENTS IN MAN 



From the Point of View of Dynamics 



PAGE 



Summary. — Object of dynamics — Measurement of the forces 

 which play a part in human locomotion — Traction dynamo- 

 graph — Dynamograph for expressing the amount of pressure 

 exercised by the feet on the ground — Combination of the 

 dynamograph with a method of recording movements — The 

 laws of ballistics as applied to the mechanism of jumping — 

 Combined employment of dynamography and chronophoto- 

 graphy — Mechanical work done in human locomotion ; work 

 in the vertical direction; work in the horizontal direction; 

 work done in maintaining the movement of the lower limbs 

 during their period of suspension — Relative amount of work 

 done during different kinds of paces — Practical applications 146 



CHAPTER X 



LOCOMOTION IN MAN 



From an Artistic Point of View 



Summary. — Influence of Photography on Art— Different cha- 

 racteristics of ancient and modern works of art — Photo- 

 graphy catches the real attitude — Importance of representing 

 the correct outline of muscles during different actions — 

 Photographs taken from different points of view — Photo- 

 graphs taken from above — Study of the most characteristic 

 attitudes in a movement— Importance of having a series 

 of photographs from which to choose the most expressive 

 attitude — Analysis of facial expression — Choice of the best 

 method for procuring artistic results 1G9 



CHAPTER XI 



LOCOMOTION OF QUADRUPEDS 



Summary. — Chronography shows how the feet rise and fall in 

 the different paces of a horsi — Transition or passage from 



one pace i nother Representation of the attitudes in all 



paces of a horse, as shown by chronography and hoof-marks 



