. Bulletin. Science. Figure 66.—Page's rotating motor. From American Journal of Science, 1838, vol. 35, p. 262. was a paddle wheel, where an armature was kept in constant motion by a commutator switching on a field to tease the armature ahead at the right time. The engines of Ritchie, Jacobi, Davenport, Davidson, and Froment were of this second form. After mid- century there was a further proliferation of electric motors, but no new basic types were introduced until the advent of AC power. In spite of the sanguine hopes of many of the early inventors, most scientists and engineers could not se

. Bulletin. Science. Figure 66.—Page's rotating motor. From American Journal of Science, 1838, vol. 35, p. 262. was a paddle wheel, where an armature was kept in constant motion by a commutator switching on a field to tease the armature ahead at the right time. The engines of Ritchie, Jacobi, Davenport, Davidson, and Froment were of this second form. After mid- century there was a further proliferation of electric motors, but no new basic types were introduced until the advent of AC power. In spite of the sanguine hopes of many of the early inventors, most scientists and engineers could not se Stock Photo
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. Bulletin. Science. Figure 66.—Page's rotating motor. From American Journal of Science, 1838, vol. 35, p. 262. was a paddle wheel, where an armature was kept in constant motion by a commutator switching on a field to tease the armature ahead at the right time. The engines of Ritchie, Jacobi, Davenport, Davidson, and Froment were of this second form. After mid- century there was a further proliferation of electric motors, but no new basic types were introduced until the advent of AC power. In spite of the sanguine hopes of many of the early inventors, most scientists and engineers could not see any advantage in the use of electric power over that of steam. The greatest difficulty in the use of elec- tricity lay in the relatively high cost of production of electrical power in comparison with that of steam. Instead of consuming coal in a chemical reaction that produced heat and the expansion of water, one dissolved a metal in an acid in a chemical reaction. 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 work.. Smithsonian Institution; United States. Dept. of the Interior; United States National Museum. Washington, Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off