210 



METHODS OF COMMUNICATION FOR FOREST PROTECTION 



four (4) immersions in all have been made, and thereafter if any deposits of copper 

 or any red spots appear on the sample, or if the galvanizing appears corroded or 

 removed, the sample shall be considered defective and the shipment represented by 



the sample rejected. 



/ 



(c) Standard Solution. The standard solution of copper sulphate shall consist 

 of a solution of commercial copper sulphate crystals in water having a specific 

 gravity of 1-185 at 70 F. The" temperature of the solution shall not exceed 70 F. 

 nor fall below 60 F. while the sample is beinig tested. 



2 Specifications for Galvanized-iron Telephone Wire 



General description. The finished product desired under these specifications 

 consists of galvanized B.B. wire as hereinafter specified. 



Finish. The wire shall be cylindrical in form and free from scales, inequali- 

 ties, flaws, splints, and other imperfections. The finish of the wire shall be in 

 accordance with the best commercial practice. Each coil shall be warranted not to 

 contain any weld, joint, or splice in the rod before drawn. 



Galvanizing. The wire shall be well galvanized in accordance with the speci- 

 fications for the galvanizing of iron and steel given in Specifications No. 1. 



ELECTRICAL REQUIREMENTS 



Electrical resistance. The resistance of the wire in ohms per mile at a tempera- 

 ture of 68 F. shall not exceed the quotient arising from dividing the constant 

 number, fifty-six hundred (5,600), by the weight of ihe wire in pounds per mile. 



MECHANICAL REQUIREMENTS 



Dimensions. The diameter of the galvanized wire shaH be within the limits 

 given in the following table: 



Breaking weight. The breaking weight of the wire shall not be less than two 

 and eight-tenths (2-8) times the weight of the wire in pounds per mile. 



Torsion. The wire shall be capable of withstanding at least fifteen twists in a 

 length of 6 in. 



Coils. The length of the wire in each coil shall be as follows: No. 6 B.W.G., 

 approximately J mile; Nos. 8, 9, 10, 12 and 14 B.W.G., approximately i mile. 



In the case of wire less than 0-134 in. in diameter, one-third of the coils may have 

 two pieces to a coil, joined by the ordinary twist joint carefully soldered and galvanized. 



In the case of wire 0-134 in. in diameter, and larger, each coil may consist of two 

 pieces only, joined by the ordinary twist joint carefully soldered and galvanized. 



Binding. Each coil of wire shall be securely bound in at least four places with 

 galvanized iron wire. A tag shall be attached to each coil giving the size and grade 

 of wire in the coil. 



