switch ; D, snap switch ; E, socket with nail plug in it ; F, fuse gap ; G, flush 

 /, /, K, resistance wire. 



Application 50. Robbers had cut the telegraph line be- 

 tween two railroad stations (Fig. 122). The broken ends of 

 the wire fell to the ground, a number of feet apart. A farmer 

 caught sight of the men speeding away in an automobile and 

 he saw the cut wires on the ground. He guessed that they 

 had some evil purpose and decided to repair the damage. He 

 could not bring the two ends of the wire together. He ran 

 to his barn and found the following things there : 



A ball of cord, a pickax, a crowbar, some harness, a wooden 

 wagon tongue, a whip, a piece of iron wire around a bale of 

 hay (the wire was not long enough to stretch the whole 

 distance between the two ends of the telegraph wire, even 

 if you think he might have used it to patch the gap), a 

 barrel with four iron hoops, and a rope. 



Which of these things could he have made use of in con- 

 necting the broken ends of the telegraph wire ? 



Application 51. A man was about to put in a new socket 

 for an electric lamp in his home. He did not want to turn 

 off the current for the whole house, as it was night and there 

 was no gas to furnish light while he worked. 



" I've heard that if you keep your hands wet while you 

 work, the film of water on them will keep you from getting 

 a shock," his wife said. 



" Don't you wet your hands, Father," said his 1 2-year-old 

 boy ; " keep them dry, and handle the wires with your pliers, 

 so that you won't have to touch it." 



" I advise you to put on your canvas gloves while you 



