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Inventory no. 84594 - Former Display Label


Signed: "C.I. Co. Ltd. C106656" and trade mark and initials of the Cambridge Instrument Co. Ltd.
Similar in action to Kelvin's quadrant electrometer. The cylindrical aluminium housing contains four brass cross-connected plates between which rotates a small needle of gilded glass (0.02 mm. diam.). The electrometer is fixed to a microscope stage and the deflection of the needle is measured by a micrometer in the microscope.
Professor F. A. Lindemann, later Lord Cherwell, designed this electrometer in 1924 and used it with a photo-electric cell to measure the light intensity from stars, nebulae, etc.
Transferred from the Physical Chemical Laboratory


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