OBSER VA TOR Y BEEHIVE FOR TEMPORA R y USE. 7 9 



mitred together at the corners. Half a window is 

 shown in the right-hand part of Fig. 69. The inside 

 measurements of the window frames are the same 

 as those of the inner frame A, and the breadth of 



J 



ffn 

 17 



Fig. 73. Inside Frame of Observatory Beehive. 



the top and side pieces is Ij in. The bottom piece 

 is If in. wide, which throws the line of the bottom 

 corner joints a little out of a true mitre of 45. 

 This can be obviated by making the four pieces of 



