Fig. 23 



Temperature recorder. The recorder with the co-ordinate paper 

 in the lower box with a glass door. A curve representing the tempera- 

 ture difference between the ingoing and outgoing water is directly drawn 

 on the co-ordinate paper. Above are three resistance boxes, and the 

 switches for electrical connections are at the right. On the top shelf 

 is the galvanometer, and immediately beneath, the plug resistance box 

 for altering the value of certain shunts. 



