tOf 'TUMBLE ENGINEER 3<y 



quick turn shut oil and open up (he water supply which 

 requires merely a twist of the wrist. 



If the injector fails to take hold at once don't get 

 ruffled but repeat the above move a few times and you 

 ^oon start it. and if you liave tact (it is only another 

 word for natural ability) you will need no further in- 

 structions to start your i But remember that no 

 injector can work coal cinders or chaf and that all joints 

 must l< it. Don't forget this. 



It is now time to give some attention to the heater. 

 A'lnlc the lu no part of the pump, it is connected 



with it and docs its work between the two horizontal 

 check valves. Its purpose is to heat the water before it 

 passes into the boiler. The water on its way from the 

 pump to the boiler is forced through a coil of pipes around 

 whicli the i steam passes on its way from the 



cylinder to the exhaust nozzle in the smokestack. 



The heaters are made in several different designs, but 

 it is not necessary to describe all of them, as they require 

 little attention and they all answer the same purpose. 

 The most of them are made by the use of a hollow bed- 

 plate with steam fitted heads or plates. The water pipe 

 passes through the plate at the end of the heater into a 

 hollow chamber, where it is joined to a coil of pipe the 

 other end of which passes back through the head or plate 

 to the hot water check valve and thence into the boiler. 



