A laboratory course in experimental physics (1896)
Loudon, W. J. (William James), McLennan, John Cunningham, joint author · New York and London, Macmillan and Co. · leaf 19
y instruments with fixedbranches. If it is desired to find the width of an opening, thetwo heads E, E are inserted in it, and then separated as far as 8 EXPERIMENTAL PHYSICS. possible. By means of a special scale and vernier on the armAB, readings for such measurements can be taken directly. III.… … Fig. 7- THE CATHETOMETER. 9 of a vertical metal cylinder AB with a scale CD inserted in it,is movable about a vertical axis, and is supported on a platformfurnished with three adjustment screws. On this platform aretwo spirit levels, by means of which the perpendicularity of ABmay be tested.…
Physics
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