The microscope : its construction and management : including technique, photo-micrography, and the past and future of the microscope (1893)
Heurck, Henri van, 1838-1909 · London : C. Lockwood ; New York : D. Van Nostrand Co. · leaf 286
marked from0° to 700. To set the instru-ment, after the clock-work has been woundup, it is placed on aperfectly horizontal sur-face, and having re-moved the mirror, ametal rule, diametri-cally placed with regardto the dial, is fittedinto the axis of theclockwork, which passesthrough it like a… … Fig. 182. 266 PHOTO-MICROGRAPHY. time and the declinations of the sun for every ten successive days. Atthe end of the shorter arm the rule is pierced with a slit, throughwhich the numbers of the hours engraved on the dial can be seen.To set the apparatus at any hour of the day, the rule is turned…
Microscopy
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