AN EASILY CONSTRUCTED MOTH-TRAP. 



115 



The hole must be covered by a small trap-door, t, running in a 

 frame, so that it can be pulled out at the top by a small knob in 

 its centre. On the inside of each side nail two strips of wood 

 from D to J, two from k to m, the higher one being slightly longer 

 than the lower, and two, one from the point of the highest strip 

 at K, and one from the point of the lowest strip at k, to l. These 

 strips are for the glasses to slide between. The two from d to j 

 should have a small cross-piece or plug at j, to prevent the glass 

 falling any lower ; the same at l, but this cannot be plugged till 

 after the glass is in. The point j is 12|- in. from the back, and 

 7| in. from the bottom ; the point k is 2 in. in front of j, or 

 14|- in. from the back and 7| in. from the bottom ; the point l is 

 2 in. under the lowest strip at k; the point m is clear 2 in. from 

 the bottom. 



Having fastened the sides on to the bottom, next put on the 

 back. This is of wood, and is made of two equal halves, the 

 lower half being firmly nailed to the sides and bottom, and the 

 upper half being fastened to the top of the lower by a pair of 

 hinges, so that it will fall down over the lower half, or can be 

 fastened up to the back of the trap by a couple of wooden 

 buttons, which should be fixed on a strong wooden bar, nailed 

 across the top from a on the one side to a on the other. The 

 top half of the back, when open, will enable the lamp (an ordi- 

 nary duplex, burning crystal oil) to be inserted or removed. 



Next, nail in a wooden partition the whole breadth of the trap 

 from F to G, having a piece of glass 6 in. square inserted in the 

 centre of its breadth, so that the centre of the glass comes oppo- 

 site the point j, — i.e., about 7 J in. from the bottom. This 

 partition should be 9 in. from the back, which allows ample room 



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