Farmers' Bulletin 73^ 



The top is then nailed in the upper hoops and the sides {H) formed 

 by closely tacking screen wire on the outside of the hoops. Four 

 laths (/) (oc^ light strips) are nailed to the hoops on the outside of 

 the trap to act as supports between the hoops, and the ends are al- 

 lowed to project 1 inch at the bottom to form legs (•/). The cone 

 (/t ) is cut from the screen and either sewed with fine wire or 

 soldered where the edges meet at {L), or a narrow lath may be 

 nailed along these edges. The apex of the cone is then cut off to 

 give an aperture {31) 1 inch in diameter. It is then inserted in the 

 trap and closely tacked to the hoop around the base. 



I'iG. 2. — Conical hoop fljtrap, top view. Letters designate parts as in Figure 1 



The construction of a cone of any given height or diameter is 

 quite simple if the following method be observed. It is best to cut 

 a pattern from a large piece of heavy paper, cai'dboard, or tin. 

 Figure 3 illustrates the method of laying out a cone of the jjroper 

 dimensions for the above trap. An ordinary square is placed on 

 the material from which the pattern is to be cut; a distance (22 

 inches) equal to the height of the cone is laid off on one leg of the 

 square at ^4, and a distance (9 inches) equal to one-half of the 

 diameter of the base of the cone is laid of on the other leg at B, 

 and a line is drawn between the points .1 and B. "With the distance 

 between these points as a radius and with tlie point .1 as a center, 

 the portion of a circle, C, D, is drawn. With a pair of dividers, the 

 legs of which are set 1 inch apart, or with the square, lay off as many 



