A laboratory manual in physics, to accompany Black and Davis' "Practical physics for secondary schools," (1913)
Black, Newton Henry, 1874- [from old catalog] · New York, The Macmillan company · leaf 60
, as the rod expands, turns a bentlever (£) about a point (A). The expansion of the tube Steam ^^ r A Fig. 25 is magnified as many times as the short arm (AB) of thelever is contained in the long arm (CD). Therefore to getthe actual expansion we have only to divide the movementof the pointer by the… … Fig. 26 The rotation of the needle is measured on a circular scale bya pointer. Evidently if the needle turns around once, thetube has expanded a distance equal to the circumference ofthe needle; and if it turns less than a complete revolution,the tube has expanded the corresponding fraction of…
Physics
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