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Three Pulse glasses


Free to use with attribution CC BYCredit: Wellcome Collection
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3 Pulse glasses. First; Half-minute sand glass, fixed in wood stand, split. Times at 30sec. Second; Pulse glass in chromium plated case, with removable lid and split ring for suspension. Case marked "1/4 min", timed at 16 sec. Third; half minute sand glass, in brass case designed for suspension, screw-top missing. Times at 31 1/2 sec



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Three Pulse glasses. Credit: Wellcome Collection. CC BY

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