A. Jt is when the v .tficicnt to cover all 



parts exposed to the fla: 



Q. \' thing to do on discovering that 



in the fire. 



Q. WouM it be safe to open the safety valve at 

 such time? 

 No. 

 Q. Why not? 



il<l relieve the pressure on the water \\hich 

 being allowed to flow over the excessive hot iron would 

 :i into ft ::<! might cause an explosion. 



Q. Why do boilers sometimes explode just on th* 



rting the engine? 

 Because starting the engine has the same effect 



the sat e. 



Q. Are there any circumstances under which an en- 

 ginct 1 in allowing the water to get low? 



o. 



Q. Why <lo they sometimes do it ? 

 A. From carelessness or ignorance. 

 Q. May not an engineer be deceived in the guage 

 of water* 

 es. 



to be blamed under such circumstances 

 Yes. 

 Q. Why? 



