made with strongly contrasting Ludlow, 2d, at Waterford, N. Y. north and south surfaces, therefore a light is required to read it at night. Pocket and surveyors' compasses THE CRAIG MICROSCOPE. have hitherto been made without floating cards. The The annexed engraving represents a microscope card is… … carried in the pocket, and prevent undue wear of the setting, the card is raised off the vertical pivot when not used, by a small arm, which is bifurcated at the center, under the card, and its nib, a, extends to the outside of the case. The slide, b, when pushed to the one side, acts on an…
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