. The art of lead burning; a practical treatise explaining the apparatus and processes. er No. I. The beginner will notice in Fig. lo that thisair holder is so constructed that it gets its airpressure direct from the head of water, and alsothat this pressure can be varied by making theconnecting piece of pipe longer or shorter, asmay be desired. Of course, the pressure willvary slightly as the water descends into the airchamber, but not enough to make it objection-able, as it will be the helpers duty to watch thewater line and renew pumping as often as thewater falls below a certain point. To
. The art of lead burning; a practical treatise explaining the apparatus and processes. er No. I. The beginner will notice in Fig. lo that thisair holder is so constructed that it gets its airpressure direct from the head of water, and alsothat this pressure can be varied by making theconnecting piece of pipe longer or shorter, asmay be desired. Of course, the pressure willvary slightly as the water descends into the airchamber, but not enough to make it objection-able, as it will be the helpers duty to watch thewater line and renew pumping as often as thewater falls below a certain point. To make this holder, a tank, a, Fig. lo, 12inches high and 18 inches in diameter, should beconstructed of galvanized sheet iron. On thistank double seam a flat bottom. The top mustbe raised slightly, as shown, to give it can be done with the raising hammer, or it THE ART OF LEAD BURNING. 43 can be done by making the circle for the top ^inch larger than the bottom, then making a cutto the center. It can then be drawn together andriveted in any desired pitch. A hole must be. Fig. 10.—Air Holder No. I. punched in the center of this top large enough toreceive a i-inch galvanized pipe, b. Six inchesapart and 2 inches from the edge punch twoholes, c and d, large enough to receive pieces of 44 THE ART OF LEAD BURNING. ^-inch galvanized pipe. This top should thenbe fitted and placed on the body of the tank. Take a piece of i-inch galvanized pipe, e,sufficiently long to touch the bottom and pro-jecting I inch out of the top of the tank, cut athread on the projecting end and drill the otherend full of ^-inch holes, /, to the hight of i inch,to allow the water to flow freely. This pipe restson the bottom of the lower tank and carries theweight of the upper tank. Solder this pipe inplace. Then take two ^-inch nipples, i inchlong, and solder them into their places, and onthese nipples screw two y^-moh hose end gascocks, c and d. One of these cocks is for the pur-pose of connect
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