CONTENTS 



CHAPTER III 



MOVEMENT 



Its Measurement, Graphic Representation, and Analysis by 

 means of chronophotography 



PAGE 



Summary. — The understanding of a movement implies a double 

 knowledge, namely, that of space as well as that of time — 

 Graphic representation of a movement — Chart of a train 

 travelling along a l.ne — The curve of a prolonged movement 

 should be recorded in sections — How a moving body can 

 record its own movement — Proportional enlargement and 

 reduction of the recorded movement — Odography — Photo- 

 graphic record of movement — Photography of the movement 

 of Lippmann's electrometer — Determination by means of 

 chronophotography of the movements executed by ;i falling 

 body — Construction of the curves of movement from clirono- 

 photographic images — Time-curve of the distance traversed 

 — Curve of velocity — Curve of acceleration . . . .33 



CHAPTER IV 



CHRONOPHOTOGRAPHY ON FIXED PLATES 



Summary. — Object of chronophotography; principles of the 

 method ; measurement of time and space — Influence of the 

 extent of surf.ice covered by the object which is to be photo- 

 graphed ; influence of the rate of movement— Geometrical 

 chronophotography — Stereoscopic chronophotography — 

 Method of multiplying the number of images without pro- 

 ducing confusion— Alternating images — Separation of the • 

 images ou the photographic plate; separation by moving the 

 apparatus — Separation by employing a revolving mirror . 54 



CHAPTER V 



DESCRIPTION OF THE APPARATUS 



Summary. — Construction of the apparatus— Slide, object-glass, 

 circular diaphragms — Erection of the dark background at 

 the physiological station — Dark background for p.ioto- 

 grapning objects in water — Photography of light objects in 

 darkne.-s or in a red light — Colour of objects, and way of 

 illuminating them — Disposition and preparation of the dark 

 field — Choi ,«• of the object-glass — Focussing — How to take 

 the photographs 67 



