MBLE ENGINEER. 15 



someone had bcr -ring with their engines tod 



i around al*mt it, while the facts were that the 

 supply being open t nply flowed in from at- 



mospheric pressure, in order to fill the space made vacant 



.mdcnsc A ill find further on 



all c; .cs are arranged to prevent any flowing out 



or, hut nothing to prevent water flowing in. 



i an occurrence will do no harm, hut the knowing 



as done may prevent your giving yourself away. 



good a: tin hoilers says: "All ex- 



>ns come either from poor material, po nan- 



too high pressure, or a too low gauge of water." 



to protect yourself from the first two causes, buy 



your engine from some factory having a reputation for 



LT good work and for using good material. Th< 



NCS depend very much on yourself, if you are 

 running your own engine. If not, then see that you 

 an engineer who knows when his safety valve is in 

 good shape and who knows when lie has plenty of water, 

 or knows cnou-h to pull his fire, when for some reason 

 the hould become low. If poor material and 



poor workmanship were unknown and carelessness in 

 icers were unknown, such a thing as a boiler 

 ^n would also be unknown. 



iht have made up your mind by this time 

 I luive no use for a careless engineer, and let me 



