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 . Jigghi^-Machine. termittent plunger. The small and heavy particlesfall through ami are sorted by an ojiposing streamof water ; tin- heavy and larger fall into a ragging-box, and the liglit are washed otf. Jig-saiw. A vertically reciprocating saw, movedby vilirating lever or crank-rod, as in Fig. 2722, inwhich the saw is arranged between two sliding head-blocks,
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 . Jigghi^-Machine. termittent plunger. The small and heavy particlesfall through ami are sorted by an ojiposing streamof water ; tin- heavy and larger fall into a ragging-box, and the liglit are washed otf. Jig-saiw. A vertically reciprocating saw, movedby vilirating lever or crank-rod, as in Fig. 2722, inwhich the saw is arranged between two sliding head-blocks, to the \ipper one of which is attached an in-dex to mark the bevel, a vernier plate being fixed tothe circular iron-banded timber to which the blocksare secured by braces. It is moved liy a segment ofa cog-wheel under the carriage, gearing and workinginto pinions, and by a pulley-band over a drum. Fig. 2723 is a form of portable jig-saw, which isreadily attached to a carpenters bench or an ordi-nary table by means of a screw-clamp. The iron. arm terminates fg- 2722. in the guide d,in which worksthe spindle towliich tile ujiperend of the saw isattached, its low-er extremity be-ing similarly heldin the guide un-ilerneath the ta-ble. A constanttension of theblade is main-tained by the bentsprings e and /.Motive - power iscominu II icatedfrom the treadle,which may be at-tached, at anyconvenient pointon the Hoor, to arod whicli fonnsa sleave for asmaller rod, whichis connected withtlie crank of thelarge wheel object ofmaking the rodin two portions isthat it may to suitany bight of ta-ble, and afterwardheld in positionby the set the cir- Jig-Saw. cnniference of the wheel a is placed a covering of leather, by thefriction of which the jiulley b and the Hy-wheel con-nected therewith are actuated. By Jig- 2723. means of the pit-man, as shown,motion is trans-mitted to thesaw. g is an ad-justable metallicloot, designed forholding the workin jilace while be-in
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Keywords: ., bookcentury1800, booksubjectin, booksubjectmechanicalengineering
