Abstract
THIS instrument depends for its action upon the opening and closing of a minute volute Bourdon tube, which for this purpose is filled with expansive liquid and hermetically sealed. One end of the tube is fixed, and the free end is brought into contact with the short arm of a lever, the long arm of which forms a rack gearing with a pinion which carries the pointer. The position of the tube with regard to the short lever-arm is such that for ordinary purposes the divisions on the dial are equal, while for clinical use the scale is an increasing one, in order that near blood-heat the divisions become wider to permi of a fraction of a degree being read off accurately.
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Immische's Thermometer . Nature 34, 234 (1886). https://doi.org/10.1038/034234a0
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DOI: https://doi.org/10.1038/034234a0