Allen, Charles Ricketson, 1862- [from old catalog] · New York, H. Holt and company · leaf 243
tre. It is not as satisfactory as acompass. 230 APPENDIX C. Mercury Cups. (See Fig. 113.)—Constructed out of blocks ofhard-wood (hard pine is good), 3x2 in. and | or 1 in. thick. Nearone end bore two holes, H, half an inch in diameter and half aninch deep, and near the other ends place two… … other running down to the bottom of the corresponding hole,where it is bent into the form of a flat spiral. If the wire isinsulated, the insulation must be removed from the part in thehole, and the wire scraped clean and bright. For use, fill theholes two-thirds full with mercury. The only expense…
Physics
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