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 . rtillery to defend those fortificiitions ;being hollowed out iu many places into the form ofimmense mortars. These mortals they fill withcantars of cannon-balls, shelLs, stones, and otherdeadly materials ; and if an enemys .ship shouldapproach with a design to land, they fire the wholeinto the air. The effect of this tremendous inven-tion must be very great, as
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 . rtillery to defend those fortificiitions ;being hollowed out iu many places into the form ofimmense mortars. These mortals they fill withcantars of cannon-balls, shelLs, stones, and otherdeadly materials ; and if an enemys .ship shouldapproach with a design to land, they fire the wholeinto the air. The effect of this tremendous inven-tion must be very great, as it will produce a showerfor 200 or 300 yards around, and would make greathavoc among a debarkation of boats. A cantar isabout 100 pounds weight; and as the mouths of someof these mortars are 6 feet wide, they will throw, ac-cording to calculation, 100 cantars each. — Froman account written just before the submission of theisland to General Buonaparte, 1798. MORTAR-BED. 1480 MORTISE-CHISEL. 4. A sliort, tliick candle. Mortar-bed. The frame on wliieli a mortarrests tor tiring. Mortetr-engine. A maeliine for grinding andeonibining materials into mortar. See MoKTAii- MILL. Mortar-mill. In the mortar-mill the saud, lime,Fig. Mortar-Miti. and mortar are compounded together by rakes at-taelied to the arms of a revolving wheel that movesround in a circular bed. In the examples given, — a is a large loam and mortar mill on the Chilianprinciple. 6 is a mortar-tempering machine turned by hand-crank. c is a moilar-mill on the same truck with thesteam-engine which rotates the edge-stones in thebed. Fig. 3231. Fig. 3231 .shows a mortar-mill on a large scale, oc-cupying several floors of a building. The lime isslaked in a revolving barrel A, and discharged intoa settling-vat. From this the paste passes tothe curing-vat Jt, and i.« pumped thence into theup[ier one of three mixing-cylinders JJ U D. Theserevolving cylinders are slightly tapering, and haveteeth on their inner surfaces
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Keywords: ., bookcentury1800, booksubjectin, booksubjectmechanicalengineering
