. The art of lead burning; a practical treatise explaining the apparatus and processes. copperas, as it is com-monly called. Then pour in clear water until itflows out of the trap screw ^. This screw canbe made tight by using for packing a piece ofwicking which has been saturated with preparing the apparatus as above, refer tothe cut of the complete apparatus and comparethe connections on the cut with those made fromthe above directions, to make positive that theyare right. If they agree, the apparatus is nowready for use. Testing the Apparatus. It is necessary to test the generat
. The art of lead burning; a practical treatise explaining the apparatus and processes. copperas, as it is com-monly called. Then pour in clear water until itflows out of the trap screw ^. This screw canbe made tight by using for packing a piece ofwicking which has been saturated with preparing the apparatus as above, refer tothe cut of the complete apparatus and comparethe connections on the cut with those made fromthe above directions, to make positive that theyare right. If they agree, the apparatus is nowready for use. Testing the Apparatus. It is necessary to test the generator for leaks,as a small blow hole may sometimes be left insome of the seams or the cocks or cleaning screwsbecome defective. To do this, first close the gas cock on the top THE ART OF LEAD BURNING. 57 of the gas chamber and make up the cleaning andcharging screws, which must be set on a bed ofsoft putty. Then fill the acid chamber full ofhot water, first measuring the water so as to as-certain just how much solution is required in pro-portion to the amount of water, as it takes the. PiS- 15-—Mixing Fork. same quantity at all times. Allow it to stand fora few moments, then mark the water line with apencil or nail, when it should be left standing foran hour. The water should stay at the mark in-dicated for an indefinite time. If it sinks duringthis test it shows that there is a leak in the gen-erator and it must be located and repaired. To locate the leak the gas cock should be 58 THE ART OF LEAD BURNING. Opened and the water allowed to run into the gaschamber. If this does not show the leak, forcethe water back into the acid chamber, which isdone by attaching the air pump to the gas taking a piece of soap and making a stifflather, daub it over the cocks and cleaning andcharging screw. When the leak is found theescaping air will cause bubbles to be blown. Ifthe leak does not become apparent after theabove process, the side boards of the generatorshould be taken off an
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