a of practicality, and the latter abandoned the idea of manufacturing the watch; what had started out as a very simple watch of few parts grew, with every effort to make it workable, more and more complicated by involved and expensive detail. It appears that Hopkins did not possess the rare gift of improvement by simplification. This is a rare gift, and one seldom possessed by an individual very closely and intensely involved in the minute details of a given problem.
[Illustration: Figure 7.--PART OF THE DRAWINGS FROM U. S. PATENT 186838, showing the winding and setting mechanism very nearly as it was applied in the Auburndale rotary.]
How long this period of development and experimentation required is unreported. It could hardly have started before early June of 1875, when application was made for the patent (165830) to prevent overbanking. The cash book of William B. Fowle of Auburndale, Massachusetts, tells us that he bought half of William D. Colt's half-interest in the Hopkins rotar