. Model engine construction, with practical instructions to artificers and amateurs. ce, and carries a balance weight—consisting of a piece of brass, cored out for the lever,which passes through it—which is fixed in positionby a set-screw. There is another short lever keyedto this weigh-bar, which by its free end is pivoted toa rod, which again is pivoted to the reversing-leverworking in a quadrant. This quadrant is a smallcasting, having feet or lugs, by which it is boltedto the bed-plate, or the foot-plate of a quadrant must be correctly curved at the top tosuit the locking-ba
. Model engine construction, with practical instructions to artificers and amateurs. ce, and carries a balance weight—consisting of a piece of brass, cored out for the lever,which passes through it—which is fixed in positionby a set-screw. There is another short lever keyedto this weigh-bar, which by its free end is pivoted toa rod, which again is pivoted to the reversing-leverworking in a quadrant. This quadrant is a smallcasting, having feet or lugs, by which it is boltedto the bed-plate, or the foot-plate of a quadrant must be correctly curved at the top tosuit the locking-bar, and notches cut in it to corre-spond with full-forward, backward, and mid-gear.(The positions for these notches should be foundout by trial with steam afterwards.) The reversing-lever is an iron rod forged or filedout of iron wire, with a turned handle on the is pivoted to the foot of the quadrant, and a rodis pivoted to the lever (see drawing) a short wayunder the notch-plate, which by its other end BEVEBSING-GEAB. 145 engages with the short lever on the > o a> °§ • *. ID |.s •>-J 00 .5 fl © pq J,* o ?— oo A small spring attached to the handle of the 146 MODEL ENGINE CONSTRUCTION. reversing-lever, causes the locking-bar to be thrustdown into the notches. Pressing a small levertowards the handle compresses the spring, and liftsthe locking-bar out of its notch. At the lower endthe bar, which is pivoted to the small lever, isheld close to the reversing-lever by a ring thatsurrounds both of them. Good fitting of all pinsand joints is necessary to ensure accuracy, for ifthe parts be fitted up too tight, or too slack, thegear will work badly and be a failure. In a locomotive there is precisely the samearrangement of the gearing, but as there are twocylinders there must consequently be two slot-links,four lifting-links (assuming there is one on eachside of the slot-link), four eccentrics, two cou
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmachinery, bookyear18
