636 



Heat and Work. 



55 276. 1 : 9. 



55 277. l : 0. 



55278. 1:10. 



55,276. Watt's Low-pressure Engine with Condenser, Figure, with Boiler No. 55,273; s ' 

 piston diam. 40 mm; stroke 80 mm; flywheel diam. 315 mm 50.0.0 



Steam cylinder, condenser cylinder and pump bodies are of glass: the valve gearing is also arranged 

 under glass so that all processes can be observed when the engine is working. 



The engine has simple valve gearing, Watt's parallelogram, cold water pump for keeping the 

 water in a reservoir at constant level, condenser, hot water pump for emptying the condenser, feed 

 pump for the boiler, and flywheel. 



.Vi.L'77. Model Of a Thornycroft Boiler, Figure, entirely of copper, with manometer for 



'/> atin., safety valve, and pipe union -40.0.0 



In order to observe the process of boiling, the steam space is closed in on both front sides by wired 

 Heating is effected by 4 Fletcher IIUIIH-I-. 



55,278. Model of a Diirr Boiler, Figure, entirely of copper, with manometer for ' ., atin.. 

 safety valve and pipe union 



With front sides of the steam space cln-ed by glass and Fletcher burner ten heatin.i;. 



(1. 8124, 

 1909, 1910 



