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December 29, 1883


JAMA. 1883;I(25):731. doi:10.1001/jama.1883.02390250015007

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A Sensitive Thermostat.  —Dr. N. A. Randolph (Journal of the Franklin Institute) has simplified the principle of the Bunsen gas regulator as modified by Geissler, by making the diaphragm in the test-tube, of a tight-fitting rubber cork, between the diaphragm and the mercury, which, in an ordinary test tube of 6 by 1 inch, occupies 1¼ inches, he has a layer of 2 inches of rectified alcohol; this increases its sensitiveness, as the alcohol can only expand downward, and consequently drives the mercury up through the little glass tube which pierces the diaphragm and passes to within ⅛ of an inch of the bottom of the test-tube. The arrangement of the instrument for use would suggest itself to all who have used the gas regulator—that of a second rubber cork with two openings to close the test-tube, provided also with tubes, one a short one passing into the upper chamber

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