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September 27, 1913


Author Affiliations


JAMA. 1913;61(13_part_2):1124-1128. doi:10.1001/jama.1913.04350140040009

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I. EARLIER METHODS OF MEASUREMENT  Other students, appreciating the probable importance of this subject, have attempted similar measurements, but all of them were made with some modification of the mercurial thermometer. One form of this which attracted considerable attention was suggested by Galezowski. It had a flat bulb small enough to pass easily beneath the lid, and the tube extended 8 or 10 cm. at right angles to the bulb; but the glass of the bulb was so thin that the least pressure of the lid produced a rise of the mercury, and of course constant readings were imposssible.

II. THE THERMO-COUPLE  The thermo-couple is also called the "thermo-electric junction," or "thermal junction."If two strips of metal of unequal conducting power are soldered together, the line where they meet is of course a "junction." If the free ends of these two strips are connected, and then if the line

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