8 Reynolds and Moorby, Equivalent of Heat. 



chamber between the outer periphery of the wheel and 

 the cylindrical portion of the case, which is always full of 

 water when the wheel is running, whence its escape is 

 controlled by a valve, in the bottom of the case, from which 

 it passes to waste. 



By means of linkage, connected with a fixed support 

 and the brake-case, automatic adjustment of the inlet 

 and outlet passages is secured according to the position of 

 the lever, without affecting the moment on the brake-case, 

 and this linkage also affords a means of adjusting the 

 position of the lever when working. {Figs. 2 and 4.) 



To admit of adjustment for wear the shaft is coned 

 over those portions which pass through the bushes, the 

 bushes being similarly coned to receive the shaft and 

 screwed into short sleeves on the casing, so that by 

 unscrewing them the wear can be followed up, and 

 undue leakage prevented. {Figs. 2 and 3.) 



The brake levers, for carrying the load and balance 

 weights, are such as allow the load to be suspended from 

 a groove in the lever, parallel to the shaft, at 4ft. from the 

 shaft by a carrier with a knife-edge, the carrier and the 

 weights being each adjusted to 251b. {Figs. 3 and 4.) 



In addition to the load, a weight is suspended from 

 a knife-edge on the lever nearer the shaft, this load 

 being the piston of a dash-pot in which it hangs freely 

 except for the viscous resistance of the oil {Fig. 4). This 

 weight is adjusted to exert a moment of 100 foot- lbs., and a 

 travelling weight of 481b. is carried on the lever, and 

 worked with a screw of ^in. pitch, so that one turn 

 changes the moment by two foot-lbs., while a scale on the 

 lever shows the position. A shorter lever on the opposite 

 side carries a weight 74*61b. adjusted to balance the lever 

 and riding weight when the load and dash-pot are 

 removed. 



The principle of these hydraulic dynamometers is that 



