THE ENGLISH SPARROW AS A PEST. 



15 



A- the sides of the frame are (> inches wide and the shelf extends 

 inward beneath them 1 inch, the inner edges of the partitions will 

 come even with the inner edge of the frame. The partitions are first 

 nailed to the frame, 2 inches apart, beginning at the middle of each 

 side. The side flaps are nailed to the shelf after the frame has been 

 fastened in position on the corner blocks, which are 2 inches high. 

 The entrances are thus 2 inches wide and 2J inches high. The shields 

 are strips of tin nailed to the inner edge of the frame, and extending 

 below it 4| inches in contact with the inner edges of the partitions, 

 to prevent sparrows in the trap from escaping (fig. 10-e). Both 



FK;. 9. Top of Miller trap. 



shields and partitions should be painted to prevent rusting. The 

 corners between the series of entrances (fig. W^a) are closed by 

 pieces of tin or thin board hinged or otherwise arranged so as to be 

 easily opened when sparrows are to be enticed to enter. 



In case several traps are to be built, it will be advantageous to use 

 unit trap tins (fig. W-Ah), held in place by way plates (fig. IQ-Ak), 

 instead of separate partitions and shields. In this case, as unit trap 

 tins can be removed from a way plate at any time, the corners may 

 be closed permanently by the blocks supporting the frame, the 

 projecting ends thus being unnecessary. 



493 



