Figure 63. — ^Joule's motor of 1842. From Sturgeon's Annals of Electricity, 1840, 



vol. 4, pi. 5, fig. 3. 



ited and reported throughout the northern and 

 western United States. In 1850 Thomas Hall, one of 

 the assistants to Daniel Davis, a Boston instrument- 

 maker, demonstrated a miniature electric railway in 

 Boston. T. G. Avery patented an electric motor ^'''' 

 in 1851. 



One of the most prolific of these early American 

 inventors was Charles G. Page,^"^ many of whose 

 inventions (figs. 66, 67) later appeared in the popular 

 catalogs of Daniel Davis. Page began his work on 

 electric motors in 1837, and by the following year had 

 one that could be used by Davis to power a drill. ^""^ 

 Shortly thereafter Page moved to Washington, 

 D.G., where he became a Patent Office examiner. 

 After obtaining a $20,000 appropriation from the 

 Government in 1849 he was able to build two motors 

 that were definitely out of the class of "philosophical 

 toys." By the following year his reciprocating motor 

 (fig. 68) could deliver one horsepower, and a short 

 time later he was able to quadruple its output. He 

 estimated the cost of driving the lathe and saw of 



i»< U.S. Patent 7950, February 25, 1851. The Patent Office 

 model is in the Smithsonian Institution (USNM 308563). 



i»5 "Charles Grafton Page," American Journal of Science, 1869, 

 vol. 48, pp. 1-17. 



'"8 Charles G. Page, "Experiments in Electro-Magnetism," 

 American Journal of Science, 1838, vol. 33, pp. 118-120; "Electro- 

 Magnetic Apparatus and Experiments," American Journal of 

 Science, 1838, vol. 33, pp. 190-192; "Magneto-Electric and 

 Electro-Magnetic Apparatus and Experiments," American Jour- 

 nal of Science, 1839, vol. 35, pp. 252-268. 



Figure 64. — Elias' ring armature motor. From 

 La Lumiere electrique, 1882, vol. 7, p. 14, fig. 



13- 



his shop with this 4-horsepower engine as 20 cents 

 per horsepower-day.'"' In 1851 two of Page's motors 

 drove a 10-ton locomotive at a speed of 10 miles per 



i»' Charles G. Page, "On Electro-Magnetism as a Moving 

 Power," American Journal of Science, 1850, vol. 10, pp. 343-349, 

 473-476. 



PAPER 28: DEVELOPMENT OF ELECTRICAL TECHNOLOGY IN THE 19TH CENTURY! I 



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