ship’s compass card is not made with strongly contrasting == = 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 card is either fixed on the bottom of the case or the… … 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, 6, when pushed to the one side, acts on an…
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