V— v-^U- 



.L._.^... 



/ 

 /' 



a. '5 



■(^l-" 



\ 



\ 



'\ / 



\ i 



\ i 



\ i 



\ I 



Figure 33. — Smith's velocity image (the two figures at top), and his velocity, mechanism, and 

 acceleration diagrams, 1885. The image of link BACD is shown as figure bacd. The lines /jo, 

 pb, pc, and pd are velocity vectors. This novel, original, and powerful analytical method was 

 not generally adopted in English or American schools until nearly 50 years alter its inception. 

 From Transactions of the Royal Society of Edinburgh (1882-1885, vol. 32, pi. 82). 



PAPER 27: KINEMATICS FROM THE TIME OF WATT 



217 



