Q Amateur - 

 Electrician 



i4nd Wii-eless Operator 



Electric Alarm Signal for 

 Transmission Ropes 



TRANSMISSION ropes in continual 

 service eventually wear so that a 

 break begins. The simple electric device 



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A broken strand in the rope strikes the 

 wire and makes an electric contact 



shown sounds an alarm as soon as the 

 first strand breaks, or begins to unravel. 

 Immediate repairs can be made before the 

 break becomes a serious one that would 

 necessitate a new rope. 



I 



To Prevent Leather Belts from 



Slipping on Pulleys 



N the machine shop, slipping belts 

 are a source of constant annoyance, 

 and tightening does not always remedy 

 the difficulty. Powdered resin is bad for 

 the belt, though unfortunately it is widely 

 used. Its tendency is to dry and crack 

 the leather. In place of resin, whiting 

 can be used. Sprinkle it sparingly upon 



the inside of the belt. Continued use of 

 this substance has demonstrated that it 

 is the least harmful application. Resin 

 is difficult to get out of the leather; 

 whiting may be wiped off or washed out 

 with water. The best results are obtained 

 when the whiting is applied once a week. 

 A frequent cause of slipping is the failure to 

 lag the iron pulleys with a covering of 

 leather. If this detail is attended to, it will, 

 to a great extent, do away with slipping. 



Mounting a Porcelain Base Electric 

 Light Receptacle 



EXPERIMENTERS and students who 

 are using porcelain receptacles for 

 experimental and practice work, find that 

 they very often break off the porcelain 

 lugs which are used to hold the receptacle 

 to the wall. A very good and cheap 

 method of eliminating this waste is to 

 mount the receptacle on a piece of 3^^-in. 

 fiber, 3)^ in. by 3 in., \vith 8-32 machine 

 screv/s, as shown in the illustration. The 

 two holes in the corner of the fiber base 

 are used to hold it to the wall, taking the 





With the fiber base attached the porce- 

 lain socket is protected from breakage 



place of the holes in the porcelain. In 

 this way, the receptacle is guarded against 

 breakage. — Walter B. Weber. 



627 



