hute end, H, where it is fed in. This cause the spirit tube can be turned to any REVOLVING SPIRIT LEVEL. shute extends a short distance into the cylin- angle, and set there. By pressing on the der. At the opposite end of the interior of spring, S, the disk or plate is left free to re- the cylinder… … The cylinder is kept plentifully supplied ing disk is made of brass and let into the The annexed figures represent an improve- with water by pipe, 0. It is thrown on the ment in spirit levels, for which a patent was wood, and secured by screws. A spring, of stock by nozzle, N, as it enters the…
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