The accompanying illustrations show a simple and efficient method of making joints in hot-water pipes. Fig. 1 is a section of the finished joint. To make the joint, first caulk tightly to the bottom of the socket two turns of yarn as shown in the section at A. Now cut a length of yarn sufficiently long to go once round the pipe, and to form a lip as shown at B (Fig. 2). Wrap the yarn round the pipe, and just press it into the socket, leaving a space between it and the back two turns, lay the ends outside on the top of the pipe so as to form the lip shown at B (Fig. 2). The space between the yarn is now filled, as shown at C in the section, with neat Portland cement mixed with water to the consistency of cream, by pouring it in at the lip B. Before the cement is set, turn in the ends of the yarn and caulk the last turn up against the liquid cement. When the joint is set, neatly plaster a ring of neat Portland cement D round the end of the socket, when the joint will be complete. The pipes may be filled with water in about twelve hours after completing the joints. These joints, if carefully made, will be perfectly tight, and not so liable to crack the sockets by expansion as a rust joint.

Fig. 2. Joint for Hot-water Pipes.