Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 887
methods may be employed. Oneis to cause the needle to reflect a spot of light from a stationarysource, upon a horizontal scale, and by watching the movement of thespot the number of scale divisions deflection may be accurately de-termined. Another and better way is to focus a telescope on… … FIG. 632.—SCALE AND TELESCOPE. observed with great precision. When this method is used the num-bers on the scale should be reversed, in order to appear normal in thetelescope. Fig. 632 shows a telescope and scale as arranged for thispurpose. Complete testing sets, containing reflecting…
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