The materials used for this joint are as follows: two pieces of 5⁄8-inch extra strong lead pipe 9 inches long, each; one 1⁄2-inch plug stop cock for lead pipe; paste and paper; solder; 1⁄2 and 1⁄2 solder; rosin; catch pan and supports.
There are two joints to be wiped on this job and the stop cock is supported only by the rigid fitting of the lead pipe. Therefore the preparation must be thoroughly done. The brass stop will be prepared first.
The two ends of the stop cock are filed bright, then papered and tinned. This operation is the same, only on a smaller scale, as the tinning of the 2-inch and the 4-inch brass ferrule. The paper is pasted over the entire stop cock, except the two ends, which are tinned for about 11⁄4 inches.
After the lead pipe has been cut off from the coil, the ends are squared with the rasp. One end of each piece is reamed out a little with the tap borer and spread a trifle with the turn pin. With the rasp, take off the outside edge of the end that has been spread. The sketch will show this and give the angle at which the edge is to be rasped. The stop cock is now fitted into the lead pipe. The brass should enter at least 1⁄4 inch, then the lead is beaten against the brass until a tight joint is made. The other end of the brass stop is fitted into the other piece of the lead pipe and a perfect fit is made. The fitting of these two joints must be rigid as upon them depends the stability of the joint support. When these ends of the lead pipe have been fitted, the pipe is cleaned with the shave hook and paper is pasted on, allowing 11⁄2 inches for the joint. Both pieces of pipe are prepared at the same time as both ends are wiped at the same time.
The three pieces of pipe should be so wedged together that they will not fall apart when put in position for wiping. The bricks for supporting the pipe are placed the same as in the support of the horizontal round joint. The lead pipe ends are laid on the bricks. This brings the stop cock in the center without any support. If it were not for the substantial fit between it and the lead pipe, it would not stay in place. Solder straps can be put over each end of the lead pipe. Weights can be used to advantage.
When getting the heat up for these joints, pour the solder over the two joints and over the stop cock. This gets the heat properly distributed, so that both joints can be wiped while the brass stop is heated. Get the proper heat up on one joint and then the other. Come back to the first joint and wipe it and then the second one. Both joints should be wiped so as to have the same shape. The novice will experience some trouble when wiping this joint in getting the brass edge hot. Heating up the two joints together will in a large degree offset this trouble. Some mechanics take out the lever handle stop to lessen the amount of brass to heat. This is never done by a good mechanic as the two pieces will never fit together again and make a tight joint. If the plug is left in place, both the plug and body will expand equally and the pieces will fit perfectly. When wiping is started on these joints, the beginner must stay at it continually. When the brass is heated, the finished wiping can be tried over and over again. If this way is not followed, the beginner will find that most of his time will be spent trying to get a heat on the brass.
Fig. 29. - Stop cock.