Metallic Thermometers
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
P-243
2025-11-23
27
A compound bar made by riveting together two thin strips of brass and iron will, when heated, form an arc of a circle, with the brass on the outside. This unequal expansion of two metals is the regulating principle in the metallic thermometer. A convenient form is made by fastening the two metals together in the form of a spiral spring, having on the outside the one with the greater rate of expansion. One end of the spring is fixed, and the other end acts upon a pointer which marks off the temperature on a scale on the face of the instrument. Figure 1 shows a self-recording thermometer of this type. The time card is rotated once per day by clockwork, while the record is made by a pen at the end of the pointer.
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