. Appleton's dictionary of machines, mechanics, engine-work, and engineering. extending its entirewidth, through which a separate hook, provided with a vertical tightening wedge, is inserted for everysaw, which thus admits of being replaced without deranging the position of the neighboring blades. The distances between the saws, and their parallelism with the sides of the frame, are adjusted bymeans of iron blocks made of the exact thickness required in the slabs of marble; the blocks and bladesare placed alternately, and every blade is separately strained by its tightening wedge until it is s
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. extending its entirewidth, through which a separate hook, provided with a vertical tightening wedge, is inserted for everysaw, which thus admits of being replaced without deranging the position of the neighboring blades. The distances between the saws, and their parallelism with the sides of the frame, are adjusted bymeans of iron blocks made of the exact thickness required in the slabs of marble; the blocks and bladesare placed alternately, and every blade is separately strained by its tightening wedge until it is suffi-ciently tense; the blocks are sustained between two transverse bars, called gage-bars, and are allowedto remain between the blades to give them additional firmness. The traverse of the saw-frame is given by a jointed connecting-rod, attached by an adjustable loop toa long vibrating pendulum, that is put in motion by a pair of connecting-rods, placed one over the other,and leading from two cranks driven by the engine. All three connecting-rods admit of vertical adjust-. MARBLE-SAWING MACHINERY. 327 ment on the pendulum. The connecting-rod of the saw-frame is placed intermediately between theother two, but its exact position is regulated by the height at which the saws are working, as it is sus-pended by a chain and counterpoise weight, which allow it to descend gradually downwards on thependulum with the progress of the cut, so as always to keep the connecting-rod nearly horizontal. In the London Marble Works four of these sawing-machines of different sizes are grouped together,with the driving-shaft and pendulums in the middle, and so arranged that each pair of saw-framesreciprocate in opposite directions at the same time, in order to balance the weight, and reduce thevibration. Another mode of traversing the saw-frame sometimes adopted, is by means of a vertical frame thatis reciprocated horizontally on slides, and the connecting-rod, instead of being jointed, is fixed ri
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
