24 EFFECTS OF 



Q. How can lightning-conductors be pro- 

 ductive Of HABM ? 



A. If the rod be broken by weather 

 or accident, the electric fluid (being 

 obstructed in its path) will rend the 

 building into fragments., 



Q, Is there any OTHEK evil to be apprehended 

 from a lightning rod ? 



A. Yes ; if the rod be not big enough 

 to conduct the whole current to the earth, 

 the lightning will fuse the metal, and 

 greatly injure the building. 



Q. How stout is it needful for the copper wire 

 to be, that it may conduct the fluid safely to the 

 earth ? 



A. It should be (at least) one inch in 

 diameter. 



Q. Why does LIGHTNING sometimes KNOCK 

 DOWN HOUSES and churches ? 



A. The steeple, or chimney is first 

 struck j the lightning then darts to the 

 iron bars and cramps employed in the 

 building ; and (as it darts from bar to bar) 

 shatters to atoms the bricks and stones, 

 which oppose its progress. 



Q. Can you tell me how St. Brides Church 

 (London) was nearly destroyed by lightning, about 

 100 years ago ? 



