476 



Popular Science Monthly 



end. Make a right angle bend at the 

 other end 'j^i in. long, and drill it to take 

 the handle. The handle should be large 

 and substantial. It is best to buy it from 

 some supply house. 



Now you are ready to assemble the jaw 

 chps. Clean all the clips and the blade 

 with fine emery cloth before assembling. 

 Lay the bottom clip in position on the 

 bakelite block; next the spacer and then 

 the top cUp. Fasten all three securely to 

 the block by means of three No. 10/32 

 machine screws, and lock the screws with 

 acorn nuts. Assemble the screw which 

 acts as a stop for the blade, and pinch 

 the ends of the clips together, so the jaws 

 will grip the blade firmly. The hinge clip 

 is assembled in a similar manner. Fasten 

 all three blocks to the marble base with 

 the 5/16-in.-18 screws. Put a brass 

 washer and a felt washer on each screw, in 

 the order named, before assembling. 

 Fasten the blade in the hinge clip with 

 a 3^-in.-20 brass screw, and lock it with a 

 3<^-in.-20 brass nut. 



The next thing to do is to mount the 

 switch. If you mount it in an exposed 

 position, protect it with a weatherproof 

 box. Place the switch so that the hinge 

 clip is uppermost; and fasten the aerial 

 wire to this. The lead-in to the apparatus 

 and a No. 4 ground wire go to the two 

 jaw clips respectively. Space the switch 

 from the wall or support upon which you 

 mount it, by means of three wooden 

 blocks, about 1 J^ in. by 1 J^ in. and 1 in. 

 thick. Drill a J^-in. hole in each of the 

 blocks; pass the three mounting screws 

 through these and the base, turn them up 

 tightly, and your switch is then ready 

 for use. — W. H. Scheer, Jr. 



Killing Woodchucks with Deadly 

 Dynamite Fumes 



WOODCHUCKS may be easily ex- 

 terminated by the slow burning of 

 dynamite in the burrows. The kind of 

 dynamite to use is the low grade ammonia. 

 A stick of this, well saturated with kero- 

 sene, will smolder and give off a deadly 

 gas, which when confined in the burrows, 

 will asphyxiate any of the animals con- 

 tained in them. After placing and 

 igniting the stick, cover up the entrance 

 to the hole tightly so that no air can 

 penetrate or gas escape. 



A Few Tips on Splicing Fuse for 

 Discharging Dynamite 



THE proper way to cut a fuse in order 

 to splice it to another piece of the 

 same kind or to splice a fast burning fuse 

 to one that is slow burning is shown in 

 Fig. 1. The fast burning fuse is usually 

 fastened in the cap or detonator. The 

 powder surfaces are placed together and 

 lashed tight. 



The proper way of slicing the fuse when 

 two charges are to be exploded simultane- 

 ously from one main fuse is shown in 

 Fig. 2. The diagonal cuts are used to 



Splicing fuse to ignite a charge of dynamite. 

 Double splices for branches in fuse line 



give greater powder surface and to insure 

 the fire traveling from one piece to the 

 other. 



The detonator cap for a powder fuse is 

 shown in Fig. 3. Fig. 4 shows the de- 

 tonator cap for an electric exploder, while 

 Fig. 5 shows the method of splicing fuses 

 which simultaneously explode several 

 charges — each dot in the drawing indi- 

 cating a splice. 



A method of connecting the charges 

 when they are to be fired with an electric 

 exploder is shown in Fig. 6. All wires are 

 securely fastened to the charge to which 

 they are attached and the ends are 

 spliced together as shown in Fig. 7. The 

 lead-in wires should never be connected 

 with the exploder until everything is 

 ready for the shot. — Geo. M. Petersen. 



