Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . gine.) The arm on a lifting-rod the puppet-valve. T!ie upper portion of the figure (2933) is a top viewof a Western steamboat engine, the lower portion isa side cdevation on a somewhat enlarged scale. Thelifter is shown in the middle, having cHr\cd surfacesat the points of contact with the valve-levers. 4. (Founcling.) A tool used by a molder in ele-
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . gine.) The arm on a lifting-rod the puppet-valve. T!ie upper portion of the figure (2933) is a top viewof a Western steamboat engine, the lower portion isa side cdevation on a somewhat enlarged scale. Thelifter is shown in the middle, having cHr\cd surfacesat the points of contact with the valve-levers. 4. (Founcling.) A tool used by a molder in ele-vating the cope fiom the clnig. 5. a. A domestic tool for raising or adjusting thelids of a stove. b. An implement for holding hot )dates or dishes. 6. (Stm/ical.) A levator or lifting lever used ininjuries to the cranium. It belongs to tlie trephineIase. An elevator. The forms are four ; known asthe common, Louis, Petits, the triploid. 7. .V cam or icipcr used in raising a stamper orbeetle, or in depicssing the tail of a tilt-hammerhelv,.. Lift-gate. A gate which lifts instead of swing-ing on a pintle, as, — A portcullis. A farm-gate counterbalanced, and rising in guides,like a sash. LIFT-HAMMER. 1305 LIFTING^ACK. Fig. the masonry, and rested at theirupper ends against jo;{s beneath thesiU-tinibers of the bridge. Penonet, the great French engi-neer, irOS-9i, was the cliief engi-neer of the Poitis ct. Cluiussecs from1747, and did more for tlie science ofbridge-biiilding than any of his con-temporaries. He contrived a drawbridge (b) which had a short middle draw to allow the of vessels to pass when the headway beneath the bridge was sutiioient for the hulls of the vessels. This ndddle section is hinged Fig. 2934. ¥dLi;e-Lever Lifler. A canal-lock, graving-dock, or sluice-gate whichrises in vertical gi-ooves in the walls. liift-hammer. The lift-hammer is a light formof tilt-hammer inwhich the hammeris raised by a springand depressed by atreadle. When thehammer ha
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