WIRE FOR THE TRELLIS 419 



second post with the bottom of the end post pre- 

 vents the brace from pushing it over." 



It is only a question of time when iron posts 

 will come into general use. Second-hand steam- 

 pipe could no doubt be used. Iron posts are not 

 only more durable, but they do not harbor insects 

 and fungi. 



The wire ordinarily used is No. 12, except for 

 the top wire in the Kniffin training, which is usu- 

 ally No. 10, as the greater part of the weight is 

 then upon the top wire. No. 9 is sometimes used, 

 but it is often heavier than necessary. No. 14 is 

 occasionally used for the middle and upper rows in 

 the upright systems, but it is not strong enough. 

 The following figures show the sizes and weights 

 of these and similar iron and steel wires: 



No. Diameter in inches. Weight of 100 feet. Feet in 2,000 pounds. 

 9 .148 5.80 pounds. 34 483 



10 .135 4.83 



11 .120 3.82 



12 .105 2.92 



13 .092 2.24 



14 .080 1.69 



15 .072 1.37 



16 .063 1.05 



41408 



118 343 

 145 985 

 190 476 



The plain annealed iron wire costs about three 

 cents per pound, and the galvanized which is 

 less used for vineyards three and one -half cents. 

 Of No. 12 wire, about one hundred and sixty 

 pounds is required per acre for a single run on 

 rows eight feet apart, and about five hundred 



