57.6 MB (3.9 MB compressed)
3937 x 5115 pixels
33.3 x 43.4 cm ⏐ 13.1 x 17.1 in (300dpi)
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Soren Hjorth. Engraving of Soren Hjorth (1801- 70), Danish engineer & inventor, with the electric motor he devised in 1849 and patented in 1851. The base of the motor contained batteries that drew some electromagnets down into others. This recip- rocating, vertical motion was converted into rot- ary motion by a cranked flywheel (at upper right). The machine was displayed at the Great Exhibition in London, UK, during 1851 but was generally unsuccessful as a practical motor. In 1855 Hjorth patented a self-excited electrical dynamo but failed to exploit the idea. He was also Technical Director of the first Danish railway line, between Copenhagen & Roskilde, which opened in 1847.
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