ROi MBLE ENGlNECft: 135 



What i, the pr.'pcr It 

 Up to the sccuii.l gauge. 

 Q. When should you test or try the pop val 



As soon as there is sufficient pressure. 

 Q. How would had 



been standing all nil. 

 A. SI. 

 Q. \Y 



A. In order to allow the cylinder to become hot, and 

 cr or condensed steam may escape without 

 injury to the cylinder. 



Q. What is the last thing to do at night? 



Sec that there is plenty of water in the boiler, and 

 if the weather is cold drain all pipes. 

 Q. What care should be taken of the fusible plug? 



Keep it scraped d I not allow it to become 



corroded on top. 



Q. What is a fusible plug? 



A. It is a hollow cast plug screwed into the crown 

 sheet or top of fire box, and having the hollow or center 

 filled with lead or babbitt. 



Q plug a protection to a boilo 



- if kept in proper condition. 



Q. Can you explain the principle of the fusible or soft 

 plug sometimes called ? 



laced directly over the fire, and should thr 

 water fill below the crown sheet the lead turn or melts 



