LIGHTNING RODS 441 



connections should be made as perfect as possible by 

 soldering, brazing, or welding. 



1 



Points should be placed 3 feet from the end of the ridge, 

 and others should not be more than 20 feet distant, with one 

 on each chimney, cupola, or other high place. 



Wire fences should be grounded every 15 rods by means 

 of a No. 9 wire stapled along the post in contact with each 

 line wire and extending 3 feet into the ground. 



Metal roofs should be grounded from the lowest point at 

 two or four corners. If the building sides are metallic, 

 ground the lowest part of the sides at the corners. Eave 

 troughs, roof gutters, hayfork tracks, etc., should be con- 

 nected with the ground cable. 



Periodic inspection of the wire should be made to see that 

 all parts are in good condition. Necessary repairs should 

 be made at once. 



BIBLIOGRAPHY 

 Atkinson, E. Ganot's Physics. William Wood & Co. 

 Lee, S. C. "Lightning Control," Extension B ulletin No.i. Manitoba 

 Agricultural College, Winnipeg, Canada. 



GOVERNMENT PUBLICATION 



Henry, Alfred J. "Lightning and Lightning Conductors," Farmers 1 

 Bulletin 367. 



29 



