OBSERVATORY BEEHIVE FOR TEMPORARY USE. 77 



admit freely the top bar of the frames. The pro- 

 jecting ends of the top bar rest on the edges of 

 small pieces of tinplate as shown in Fig. 69. If it 

 is intended to fix the inner frame to its outer case 

 by means of dowels through the sides, the holes 



Fig. 71. Horizontal Section of Observatory Beehive. 



for them should be bored before the inner frame 

 and case are jointed up. 



It will be seen from Figs. 69 to 71 that the side 

 pieces of the case fit close to the sides of the inner 

 frame, but the top and bottom pieces F and E are 

 clear by a space of about | in. and J in. respectively. 

 The shape of the side pieces of the case G is seen in 

 Fig. 69. The top piece F is fixed to the sides by 

 dovetailing, or by nails or screws, and the bottom 

 piece E slips into a groove cut in the side pieces. 



The base H (Figs. 69 to 71), into which the lower 



Fig. 72. Sectional Plan of Observatory Beehive Top. 



ends of the side pieces are slightly sunk, is a flat 

 board with a moulded or chamfered edge, sup- 

 ported on four edging pieces mitred together at the 

 corners. The piece E is perforated with a number 

 of i-in. holes, which form a communication with 



