CONSTRUCTION POLICY IN FOREST RESERVES 41 



Material and Uses Con. Description of Equip mem --Con. 



Grounding Devices : 



Ground rods, for all ordinary indoor and out- 

 door instrument installations on grounded 



lines Galvanized-iron ground rod with copper wire 



attached ; i in. diameter by 7 ft. long, 

 Northern Electric or equal. 



Ground rods, for metallic circuits only.. ..Galvanized or plain iron ground rod, J in. dia- 

 meter by 6 ft. long, Northern Electric 

 No. 388 or equal. 



Ground plates, for special ground installations. Copper plate No. 21 Birmingham sheet metal 



gauge or No. 21, U.S. sheet metal gauge; 

 12 by 18 in. or larger. 



Ground clamps, for grounding on water-pipes. . Northern Electric type A ground clamp or equal. 



Portable ground rod, for Forestry Branch 



emergency communication kit No. 1-A. . Special Forest Service portable ground rod, 



Northern Electric No. 313-B. 



Miscellaneous Tools and Supplies : 



Brace and bits, for boring holes for brace 

 bolts and guy rods and for carrying wires 



through walls Brace, ratchet, ball-bearing head, 10-in. sweep. 



Bits, auger or car bits ; i-in., fj-in., 

 ii/ie-in., countersink. Other sizes as re- 

 quired. 



Claw-hammer, for interior installations.. ..Ordinary style; light. 



Monkey-wrench, for setting up brace bolts and 



guy rods Standard wrench, 12-in. 



Pole-steps, for poles over 30 ft. high, bearing 



test station or other special apparatus. .Galvanized-iron poles-steps, |-in. by 9-in. 



Tree-trimmers, for trimming small branches 



from ground ' Type, Northern Electric Co., New Giant tree- 

 trimmer or equal. 



Insulators, strain, for dead-ending line wire 



on trees and poles Type, White Strain Insulator No. 500 or equal. 



Strand, standard galvanized steel, for attach- 

 ing strain insulators No. IS double galvanized-steel seizing strand. 



