. Bulletin. Science. Figure 59.—Clarke's electric locomotive. From Sturgeon's Annals of Electricity, 1840, vol. 5, p. 304. Figure 58.—Clarke's motor. From Sturgeon's Annals of Electricity, 1840, vol. 5, pi. i, fig. 3. London in August 1838, one of Davenport's motors drove a small electric train of several carriages with a total weight of 70 to 80 pounds at a speed of 3 miles per hour.'^ Davenport tried to use his rotating motor to drive a Napier printing press that printed his paper "The Electro-Magnet," but the press required an engine from 1 to 2 horsepower, and he did not succeed
. Bulletin. Science. Figure 59.—Clarke's electric locomotive. From Sturgeon's Annals of Electricity, 1840, vol. 5, p. 304. Figure 58.—Clarke's motor. From Sturgeon's Annals of Electricity, 1840, vol. 5, pi. i, fig. 3. London in August 1838, one of Davenport's motors drove a small electric train of several carriages with a total weight of 70 to 80 pounds at a speed of 3 miles per hour.'^ Davenport tried to use his rotating motor to drive a Napier printing press that printed his paper "The Electro-Magnet," but the press required an engine from 1 to 2 horsepower, and he did not succeed in building such a motor until 1840.^* Success came to Davenport with his development of a reciprocating engine based on a "sucking coil" that he had begun working on in 1838. Davenport built over 100 motors in his lifetime, but lack of financial backing and his inability to obtain an inexpensive source of power defeated him. By the early 1840's there were a number of inventors of electric motors. In 1839 Robert Davidson of Edinburgh constructed an electric motor that had enough power to turn articles on a lathe or to drive a small carriage (fig. 56). Three years later, Davidson's motor could drive a carriage weighing about 6 tons for a mile and a half at a speed of 4 miles per hour.^'' 9» Mechanics' Magazine, London, 1838, vol. 28, pp. 321-323; vol. 29, pp. 95-96, 115, 166-168, 170-172. 86 Ibid., 1840, vol. 32, pp. 407-408. " Ibid., 1840, vol. 33, p. 92; "Electro-Magnetic Locomotive Carriage," Stuvgeon's Annals of Electricity, 1842, vol. 9,234-235; "The Earliest Electrical Railway," Electrical World, 1890, vol. 16, pp. Figure 60.—Wright's motor. From Sturgeon's Annals of Electricity, 1840, vol. 5, pi. 3, fig. 4. A drawing of this 1842 motor is shown in figure 57. In 1840 Uriah Clarke'* devised a reciprocating engine (fig. 58) and then applied it to a 100-pound miniature railway (fig. 59). Thomas Wright'^ reported on a recipro
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