Du Bois-Reymond Sledge Apparatus
Historical document, translated for reference. It reflects medical knowledge of the 1920s–30s and is not medical advice.
Summary
The Du Bois-Reymond sledge apparatus is a medical induction device used for electrodiagnosis and therapy. It utilizes a sliding mechanism to adjust the distance between primary and secondary coils, allowing for the precise dosing of induced faradic currents.
Encyclopedia entry (1928–1936)
DU BOIS-REYMOND SLEDGE APPARATUS, a medical inductor used for laboratory and clinical purposes (electrodiagnosis and therapy). The name "sledge" comes from the device's design, which resembles sledge runners, upon which the secondary coil can move and thus move away from or closer to the primary coil, with the distance between the coils measured by a millimeter scale located next to the runners.
This device makes it possible to dose the strength of the induction current with approximate accuracy, which is inversely proportional to the distance between the coils. The current supplying the apparatus, upon entering the primary coil, is uniformly interrupted and closed (from 20 to 200 times per second) with the help of a Wagner or Neef electromagnetic hammer, as a result of which high-voltage induction currents of closing and opening (faradic current) arise in the secondary coil.
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“Du Bois-Reymond Sledge Apparatus.” Soviet Medical Encyclopedia. English translation of Bolshaya Meditsinskaya Entsiklopediya, 1st ed. (Moscow, 1928–1936), ed. N. A. Semashko. https://sovietmedicalencyclopedia.com/article/dubois-reymond-inductor/