40 METHO'DS OF COMMUNICATION FOR FOREST PROTECTION 



Material and Uses Con. Description of Eqwpment Con. 



Special Signalling Devices Con. 



For statons outdoors Type, Northern Electric No. 292-U or equal, 



with 6-in. galvanized gongs and 2,500-ohm 

 unbiased ringers. 



Howlers, for signalling by means of vibratory 



currents as with 1004-A telephone Type, Northern Electric No. 1-C or equal. 



Condenser, for use with howler to impede 



bell-signalling currents Type, Northern Electric No. 21-F or equal. 



Repeating Coils : 



For connecting grounded to metallic line or 



taking out a phantom circuit Repeating coil; type, Northern Electric, No. 47- 



A or equal. 



Station Installations : 



Fasteners for outside wiring No. 4i solid, or No. 5| one-groove, split por- 

 celain insulator; Nos. 14 or 16, 3-in. flat- 

 head wood screws. 



Fasteners for inside wiring, single or double. . J-in. or 1-in. Blake insulated staples. 



Fasteners for inside wiring, double only.. . . i-in. milonite nails. 



Insulation for wires through walls Porcelain tubes, unglazed, diameter |-in. by 



n/ie-in. Length according to wall thick- 

 ness. 



Switches, for test stations, central switching 



stations, unoccupied stations, etc Single or double pole 15-ampere baby knife- 

 switches on porcelain bases. 



Screws, for attaching protectors, switches, 



howlers, etc., to walls ..Blued, round-head screws, length and gauge 



according to size of each article. 



Installation and Repair Tools : 

 Pliers 



For cutting insulated wire 5-in. oblique, side-cutting pliers, Klein or equal. 



For tightening binding-posts and small nuts. 5-in. or 6-in. long-nosed, oval, side-cutting pliers. 



Screw-drivers 



For setting small wood screws 4-in. machinists' style screw-driver. 



For setting large wood screws 8-in. machinists' style screw-driver. 



For setting screws in instruments 2-in. machinists' style screw-driver. 



Knives, for general insulated wire work.. ..Electricians' knife; type, Northern Electric No. 



402 or equal. 

 Soldering torch, for heating soldering irons. .Clayton and Lambert gasolene blow torch No. 



38. 



Soldering copper 



For soldering joints and other outside work. |-pound standard soldering copper. 

 For interior work and repairs to instru- 

 ments Pony soldering copper No 2, ll|-in. handle, 



weight, 3 oz. 



Installation and Repair Supplies : 



Solder Resin-core flux solder, 1-pound or 5-pound 



spools, half-and-half bar solder. 



Flux Allen soldering stick, 1 by 5-in. 



Ta P e Black friction tape, S-in. Northern Electric 



grade A or equal. 



