American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 224
wide, say from 10° to 100° F., Mr. Dent hasfound them quite near enough for the ordinaryvariation of temperature, and more than usu-ally steady in their rate ; for the best are attimes very capricious in their action, showingthat there yet remains something to be studiedbesides compensation, for… … small bent thermometer tubes, the bulb at F,in which a little air is also sealed up with themercury. As the temperature is increased, theweight and bulb not only approach the centre,but a portion of the mercury also is driven alongthe tube, thus carrying more of the weighttoward the centre at a…
Clocks and watches
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