File:Helmholtz pendulum, Berlin, Germany, 1895-1910 Wellcome L0057770.jpg

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Helmholtz pendulum, Berlin, Germany, 1895-1910
Title
Helmholtz pendulum, Berlin, Germany, 1895-1910
Description

The swing of the pendulum stimulates a nerve in a muscle. To calculate the speed, the nerve is stimulated at different distances from the muscle. Nerve stimulation and muscle contraction are recorded on smoked glass paper. Hermann von Helmholtz (1821-1894), the German physicist and physician, used a similar pendulum myograph of his design to study the speed of nerve impulses in a frog. His researches found that the speed of nerve impulses was twenty metres per second. Earlier estimates were far slower. The pendu-lum was made in the Berliner physikalische Werkstatten GmbH, which trans-lates roughly to English as the “Berlin Physical Workshop”.

maker: Berliner Physikalische Werkstatten GmbH

Place made: Berlin, Berlin state, Germany

Medical Photographic Library
Keywords: helmholtz pendulum; Ophthalmoscopes; ophthalmoscope
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This file comes from Wellcome Images, a website operated by Wellcome Trust, a global charitable foundation based in the United Kingdom. Refer to Wellcome blog post (archive).
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References
  • Library reference: Science Museum A600067
  • Photo number: L0057770
Source/Photographer

https://wellcomeimages.org/indexplus/obf_images/d9/39/fd89dcd87631e56556e168415438.jpg

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current10:31, 17 October 2014Thumbnail for version as of 10:31, 17 October 20144,349 × 3,975 (2.57 MB)Fæ (talk | contribs)=={{int:filedesc}}== {{Artwork |artist = |author = |title = Helmholtz pendulum, Berlin, Germany, 1895-1910 |description = The swing of the pendulum stimulates a nerve in a muscle. To calculate the speed, the...

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