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 74
passingthrough the objective, P2Q2 the real image formed by this lens,and the field glass, and PZQ& the final image seen at the dis-tance of distinct vision. A micrometer EF (consisting of athin glass plate on which there is generally ruled a half-centi-meter divided into fiftieths) is placed… … Fig. 45. image P^Q^ °f PQ must be in the same plane as the microm-eter. If, therefore, a finely divided scale (usually called astage micrometer) is taken for the object PQ, the observercan at once see how many divisions on this image correspondwith one division on the micrometer, and so ascertain…
Physics
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