x SOURCES OF ILLUSTRATIONS 



F. E. Myers & Bro. furnished Figs. 29 and 45. 



The Spramotor Company supplied Fig. 31. 



E. C. Brown & Co. donated Figs. 32 and 40. 



The Goulds Manufacturing Company supplied Fig. 46. 



The following figures are original or are the author's illus- 

 trations: 6, 11, 14, 15, 16, 17, 18, 19, 23, 25, 37, 38, 42, 44, 46, 

 47, 48, 52, 70, 71, 72, 73, 82, 111, 134, 135, 177, 178, 179, 190, 

 191, 193, 194, 195, 196, 197, 233 r 252, 255, 263, 268, 275, 276, 

 278, 279, 315, 316, 317, 318, 319, 331, 332, 391, 392, 403, 405, 

 407, 408, 409, 410, 411, 412, 414, 415, 418, 419, 420, 421, 433, 

 451, 452, 453, 454, 455, 456, 457, 458, 459, 460, 461, 462, 463, 

 464, 465, 467, 468, 469, 470, 471, 481, 483, 488, and 489. 



