r usually with a ruby. A ship's may be obtained by addressing the inventor, H. G. compass card is not 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.… … patented by Henry Craig, of Cleveland, Ohio. It has settles at a point north and south. In taking an ob- but one lens, and therefore requires no adjustment of servation the card is held steady by a catch plate, focus. The lens is mounted in an india-rubber disk, A vertical section of the apparatus…
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