Ballistic reflecting galvanometer, London, England, 1920-1955

Made:
1920-1955 in London
maker:
Henry Tinsley and Company
Aperiodic ballistic reflecting galvanometer. Gallery image. Group shot. Kymograph, on mahogany table stand, by C.F. Palmer, London, 1925-1935 (1981-604) Mock-up of Group shot. Kymograph, on mahogany table stand, by C.F. Palmer, London, 1925-1935 (1981-604) Three 2-volt accumulators

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Aperiodic ballistic reflecting galvanometer. Gallery image.
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Group shot. Kymograph, on mahogany table stand, by C.F. Palmer, London, 1925-1935 (1981-604) Mock-up of
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Group shot. Kymograph, on mahogany table stand, by C.F. Palmer, London, 1925-1935 (1981-604) Three 2-volt accumulators
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Aperiodic ballistic reflecting galvanometer, brass, by H. Tinsley and Co., serial No.577, NPL=39252 (certificate) & paper label E2137 London, 1920-1955

A galvanometer measures small electric currents and is sometimes used during physiological experiments studying muscle contractions as shown here.

An isolated muscle is placed on coils of wire and connected to an electrical stimulus, controlled by a switch. The muscle is also attached to the kymograph to record when the muscle contracts. When the muscle is stimulated, heat is produced and transferred to the thermocouple (cut away to show the two coils of metal which, when heated, produce an electric current). The thermocouple is attached to a galvanometer to record the electric current produced when the thermocouple is heated.

Details

Category:
Laboratory Medicine
Object Number:
1979-549
Materials:
brass and plastic (pf)
type:
galvanometer
taxonomy:
  • furnishing and equipment
  • measuring device - instrument
  • furnishing and equipment
  • measuring device - instrument
  • galvanometer
credit:
National Physical Laboratory.