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OUR PHYSICAL WORLD 



rents of low voltage. Commonly, too, when the lines cross 

 highways, the towers bear signs to the effect that the wires are 

 dangerous. A shock produced by contact with a low-voltage 

 current usually causes surprise and more or less discomfort, but 



FIG. 107. A high-power transmission line 



death is often the result of shock from a high-voltage current. 

 In case of severe shock the means of resuscitation are the same 

 as in the case of drowning, namely, the maintenance of artificial 

 respiration and of the body temperature. 



It is usually unsafe as well as undesirable from a mechanical 

 point of view to use a high-voltage current for ordinary purposes 



