AVIARIES, BIRD-ROOMS AND CAGES. 57 



to join four of them together to form the square 

 frame; but before actually screwing them up, we have 

 to arrange for our window, which will be the whole 

 length of the front, as we intend to have plenty of light 

 in our bird-room. 



We must cut the sash-rail as shown in Fig. 29, B, 

 and mortice in the holes D and E to receive it; we must 

 also mortice holes in A and B for the sash-bar, being 

 careful to get them equal distances apart, so that they 

 are opposite each other, or our squares of glass will not 

 fit. It will require a little extra care to put this frame 

 together; the best plan is to put the middle bar into the 

 uprights, fix the bottom bar, put the sashes into place, 

 and then fix on the top bar. See that the frame is 

 square, and then proceed to screw up. 



In making the end of the building we have choice 

 of two ways. We can either run the door post up to the 

 roof, or put in a bar at H, as shown in the drawing. 

 This latter method requires just one extra piece of quar- 

 tering; but we are able to get our door frame perfectly 

 square and the door to fit accurately, which we might 

 not manage if we decided to run the door-post up to 

 the roof. W T e need not go into the details of the con- 

 struction of this part of the building, for they will be 

 found in the Chapter on "Aviary Construction." 



Having made our two frames we can fix these into 

 position with just one nail at the top and bottom to hold 

 frame, and to the bar J nailed to the wall at the back of 

 the building. After getting so far we should board the 

 roof, as then we have a place to keep our spare wood 

 and tools in should bad weather supervene before we 

 have finished. 



We can next board the outside of the building with 

 matchboard; the latter should be as dry as possible to 

 obviate chance of shrinkage of the wood afterwards. It 

 should be put on upright, getting the first piece into 

 position with just one nail at the top and bottom to hold 

 it while we fix the next piece into the groove. When 

 this is done we can finish nailing the first board, and 

 put one nail at both top and bottom of the second board, 

 and so on. 



