7 o 



THE HOUSE FLY 



strip must be 22 inches in length. With the tin lying 

 on the flat surface, bend the tin along the lines ab and cd, 

 Fig. i, which are J inch from their respective sides, so that 

 the space a, b, d, c forms the bottom of a box and the several 

 parts the sides. To close the ends cut small incisions f inch 



D 



J 



FIG. 19. 



A CHEAP AND EFFECTIVE FLY 

 DESTROYER. The explana- 

 tion of the parts will be 

 found in the text. 



(Redrawn from Parrott.) 



deep at the points a, b, c, and d, as ay and ex, Fig. i. 

 Bend the flaps thus made at right angles to their respec- 

 tive parts. We then have a box 21 inches long, f inch 

 wide, and f inch deep, as at Fig. 2. 



" To make the box water-tight, solder the joints, or 

 if solder is not handy try moistened plaster of Paris. 



