compasses are formed with floating paper valve to press it firmly against its seat; the wedge cards. The magnetic needle is cemented on the cases. being loosened before the valve is withdrawn. The patent for this invention was granted through underside of the card, and it is pivoted at the center… … 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 is shown in which is operated by pressing with the finger on the at the upper end of a brass tube, and the tube is pro- Fig. 1. A is the pipe through which the…
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