Hasluck, Paul N. (Paul Nooncree), 1854-1931, ed · Philadelphia, D. McKay · leaf 19
e explained on a later page. Spirit Levels.—The spirit level is used fordetermining the planes of the horizon—thatis, the plane forming a right angle to thevertical plane. A frame firmly holds aclosed glass tube nearly filled with an-hydrous ether, or with a mixture of etherand alcohol (see Fig.… … Fig. 18.—Mitre Shooting Block. Plumb Rule and Square.—The plumb rule(Fig. 23) is used by the carpenter and fixerfor testing the vertical position of piecesof timber, framing, doorposts, sash frames,etc., which should be fixed upright. Theplumb square (Fig. 24) is useful for testing HAND TOOLS AND…
Carpentry · Joinery
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