Annual report of the Board of Regents of the Smithsonian Institution . very great length. Theformer revolutionized the feeble electromagnet of Sturgeon, and byit Henry was able to lift 3,500 pounds, as compared to Sturgeonsmaximum lift of 9 pounds. The latter was entirely Henrys inven-tion and made possible for the first time the transmission of a currentover a great distance with little loss. Every electrical dynamo ormotor now uses the electromagnet in practically the form in whichHenry left it in 1829. Joseph Henrys concern was the discovery of truth, not the appli-cation of his discoveries
Annual report of the Board of Regents of the Smithsonian Institution . very great length. Theformer revolutionized the feeble electromagnet of Sturgeon, and byit Henry was able to lift 3,500 pounds, as compared to Sturgeonsmaximum lift of 9 pounds. The latter was entirely Henrys inven-tion and made possible for the first time the transmission of a currentover a great distance with little loss. Every electrical dynamo ormotor now uses the electromagnet in practically the form in whichHenry left it in 1829. Joseph Henrys concern was the discovery of truth, not the appli-cation of his discoveries. The officers of the Penfield Iron Works,at Crown Point, N. Y., however, prevailed upon him to make them MECHANICAL TEANSPOKT MITMAN 547 a small electromagnet shortly after his announcement of 1831. Theywanted it to magnetize the iron teeth of a machine which they usedto separate magnetic iron particles from refuse in iron ore. Occasion-ally after the magnet was received at Crown Point it wae made toperform various stunts, such as holding a 100-pound anvil, for the. Figure 8—Thomas Davenport, 1802-1851. The village blacksmith of Brandon,Vt., whose electric motor invention of Feb. 25, 1837, was the first of its kind inAmerica benefit of the villagers. In consequence its fame spread and theCrown Point galvanic magnet mystery became the chief topic ofconversation for miles around. THOMAS DAVENPORT Twenty miles from Crown Point, in Brandon, Vt., Thomas Daven-port, a blacksmith, and a studious one, and his friend Orange Smalley 82322—30 36 548 ANNUAL EEPORT SMITHSONIAN INSTITUTION, 1929 * chanced to hear the wonderful tale of the magnet. It was especiallyinteresting to them for they had planned a lecture tour on scientificsubjects illustrated by experiments and they were looking for goodfeatures tp add to their repertory. Davenport traveled to CrownPoint to see the magnet, but without success. Again in December,1833, he went to Crown Point to purchase iron, and this time hesaw
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