258 Common Science 



377. Candy will cool more rapidly in a tin plate than in a china 



plate. 



378. When a trolley wire breaks and falls to the ground it melts 



and burns at the point at which it touches the ground. 



379. By allowing the electricity from the trolley wire to flow down 



through an underground coil of wire, a motorman can open 

 a switch in the track. 



380. The bare ends of the two wires leading to your electric lamp 



should never be allowed to touch each other. 



