ON HEATING PEACH-HOUSES. 23 



caulking-iron as the work proceeds, more with 

 a view to cause the liquid cement to fill the 

 vacuum than to ascertain that no empty space 

 remains in the joint being made. After the 

 cement has partly set, the third round of yarn 

 should be driven home, and the several joints 

 faced with stiff cement, and so on until the pipes 

 are all fixed, including, of course, the necessary 

 connections and valves. A man accustomed to the 

 work would make twenty joints in the manner 

 described above in one hour. A throttle-valve 

 should be put in each of the flow-pipes (where 

 they branch off from the mains) in every house, to 

 regulate the circulation of heat. Diaphragm or 

 screw-down valves should be fixed in flow and 

 return pipes of any house or houses that are not 

 likely to require heat during mid-winter, but which 

 will be in connection with the heating apparatus 

 that will be in use throughout the autumn, winter, 

 and spring months. This will permit of the water 

 being drawn from the pipes not being heated, and 

 thus prevent injury from frost. 



In placing the pipes in position prior to making 

 the joints, see that the bands in the casting con- 

 necting both rims of the individual sockets are in 

 a straight line with each other on the top, the full 

 length of each row of pipes. A line stretched 

 along the top of each row of pipes will make this 



