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| Keywords: Sturgeon electromagnet.png Drawing of the first electromagnet invented in 1824 by British scientist William Sturgeon This was his original drawing from his 1824 paper to the British Royal Society of Arts Manufactures and Commerce It was made of 18 turns of bare copper wire insulated wire had not been invented on a U-shaped lacquered iron core about 1 ft 30 cm long and 1/2 inch 13 mm diameter When the wires were connected to a single cell copper-zinc-acid battery the electromagnet could support 9 pounds The little cups contain mercury and were an early method of making an electrical contact between wires The one on the left acts as a power switch Alterations to image converted from JPG to 32color PNG Detailed information is from http //books google com/books id f8QKAAAAIAAJ pg PA17 Sylvanus P Thompson 1891 Lectures on the Electromagnet W J Johnson Co New York p 17-19 Downloaded August 9 2008 from http //siarchives si edu/history/jhp/joseph21 htm Joseph Henry's contributions to the Electromagnet Smithsonian Institution Archives neg no 46 761-D where it is credited to Sturgeon W 1824 'Improved Electro Magnetic Apparatus' Trans Royal Society of Arts Manufactures and Commerce Vol 43 Plate 3 fig 13 1824 William Sturgeon Public domain - Author died 1850 PD-old Electromagnets Horseshoe magnets History of electromagnets Joseph Henry Papers Smithsonian Institution Archives | ||||
