Ground Vermin The High Elms Trap. 303 



by means of a screw. For the admission of the treadle 

 (Fig. 17) a strip is cut out at B, gin. by 6in. long, and 

 in. wide. The two pieces of wood are nailed together with 

 two strips, each 2in. wide, and ^ m - thick. A is the spot 

 where the stanchion (Fig. 18) is screwed on. 



Fig. 19 is the cover or lid, which may consist of one 

 piece, or be made of two, similarly to Fig. 16. It requires, 

 however, to be 2in. shorter, but is equally broad. B is 

 a hole about 3in. in diameter, and ought to have its centre 

 4^in. from the back end of the cover. A piece Jin. wide 

 is cut out from this hole towards the edge, in which the 

 neck of the trigger may work. A hole is provided at C 

 for the stanchion to pass through without touching the sides. 

 D represents a staple, into which the end of the lever fits. 

 This staple is sometimes dispensed with, and the means 

 shown in the drawing of the trap set is substituted, namely, 

 a nail is driven sideways through Fig. 20 at its point, and 

 the two projecting ends are held by two staples. 



Fig. 1 8, the stanchion, must be of Jin. round iron, 

 flattened out at the foot, as shown, and bent to a radius 

 of 1 5in. About Jin. or fin. from the opposite end a pin 

 (E) about jin. long must be riveted on, so as to stand 

 out at right angles upon either side. Its thickness should 

 be such as will easily fit the hole bored through Fig. 20 

 at F. The stanchion must have two holes in the foot, 

 through which it can be screwed down to the floor at A. 

 Fig. 17 is the treadle, measuring from the notch at G 

 4in., and the rest 3in. The plate is of sheet iron, round, 

 and measuring 3^in. in diameter ; it must be riveted on at 

 H. Sometimes it is formed as shown in Fig. 21 by the 



