. Bulletin. Science. 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 elect
. Bulletin. Science. 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, , 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 ; 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»< 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. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smiths
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Keywords: ., bookauthorunitedstatesdepto, bookcentury1900, booksubjectscience
