O4 ROUGH-AND-TUMBLE ENGINEER: 



to know it. However, should you find that your gauge 

 shows, when tested with another gauge, that it is \ 

 or unreliable in any way, you should repair it at once, 

 and the safest way is to get a new one, and yet I would 

 advise you first to examine it and see if you cannot dis- 

 cover the trouble. It frequently happens that the pointer 

 becomes loosened on the journal or spindle, which at- 

 taches it to the mechanism that operates it. If this is 

 the trouble, it may be easily remedied, but should the 

 trouble prove to be in the sprjng, or in the delicate in- 

 terior mechanism, it would be much more satisfactory to 

 get a new gauge. 



In selecting a new gauge you will be better satisfied 

 with a gauge having a double spring or tube, as they are 

 less liable to freeze or become strained from a high pres- 

 sure, and the double spring will not allow the needle or 

 pointer to vibrate when subject to a shock or sudden in- 

 crease of pressure, as with the single spring. A careful 

 engineer will have nothing to do with a defective steam 

 gauge or an unreliable safety valve. Some steam gauges 

 are provided with a seal, and as long as this seal is not 

 broken the factory will make it good. 



FUSIBLE PLUG 



We have told you about a safety valve, and now we 

 will have something to say about safety plugs. A safety, 



