The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . 02 the quantity variable at will, tlie workman is in position to accomplishthe desired end speedily and effectually. To use to the best advantage, set the jamb-nut so that with the valvelever in its normal position, the flame at the end of the pipe will just keepalight. The blow-pipe can then be laid down temporarily, and againused without the trouble of turning off the gas or relighting. When used as a mouth blow-pipe, the inost convenient way to hold itis with the third finger through
The American watchmaker and jeweler; an encyclopedia for the horologist, jeweler, gold and silversmith .. . 02 the quantity variable at will, tlie workman is in position to accomplishthe desired end speedily and effectually. To use to the best advantage, set the jamb-nut so that with the valvelever in its normal position, the flame at the end of the pipe will just keepalight. The blow-pipe can then be laid down temporarily, and againused without the trouble of turning off the gas or relighting. When used as a mouth blow-pipe, the inost convenient way to hold itis with the third finger through the ring. For bellows work it is betterto pass the ring over the index finger. The ring also serves, with thevalve-lever, as a rest to hold the flame-nozzle away from the table whenthe blow-pipe is laid down temporarily. To produce an oxy-hydrogen flame, connect the air-pipe with a cylin-der of nitrous oxide, opening the cylinder-valve carefully, so as to permitthe escape of only sufficient nitrous oxide to produce, with the illuminat-ing gas, a very small flame. Regulate the illuminating gas flow with. Fiq. 2in. the thumb-screw, or with the finger on the lever of the blow-pipe valve. For soldering, use the grooved face of the pad, with or without theremovable rim (shown in Fig. 258), according to the work. The wirestaples answer the double purpose of holding the removable rim in placeand raising the pad from the table, with air-space underneath. The spring-clamps are useful in holding the parts to be soldered, theloops in the metal band around the pad permitting them to be placed inany desired position. For melting, use the reverse side of the pad, with the depression formelting-cup. Fig. 261 shows the melting-cup and ingot-mould in shield is a flat piece of metal, with a lip at one end. The smallmelting-cups should always be used, as flux adheres to the pad, and pullsoff particles of the fiber. The cup is held in place by two pins, insertedin the pad on either side,
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Keywords: ., bookcentury1800, bookdecade1890, bookidamericanwatc, bookyear1892
