58 



FARM BUILDINGS IN SOUTH AFRICA 



55 and 128 illustrate a roof of the same type applied to a cottage and 

 cow-byre respectively. In the case of the cottage the tie-beam is sup- 

 ported at mid-span by a party wall, while in the case of the cow-byre 

 the tie-beam derives support from the heel-posts of the stall divisions. 

 This support accounts for the extra distance spanned, beyond the maximum 

 span mentioned under Fig. 54. 



pc 



-Jifci Pixre 4 , 6~*3" 



Box E/?v£S, SpnN 20 ro24- fset 

 Fig. 55. 



Fig. 56 is of a king-post roof, while Fig. 127 shows a similar roof 

 (with queen- posts added) employed to cover a cow- by re. 



Sp/w 20 ro 24f£et. 

 Fig. 56. 



Figs. 57, 58, and 59 illustrate king- and queen-post roofs suitable for 

 spans ranging from 24 to 38 feet, while Fig. 130 shows such a roof used 

 for a wide cow-byre. In Fig. 59 note the wrought-iron strap, of U form, 

 bent over the foot of the king-post and tie beam, and bolted through 



with -jj-inch bolts. 



Notes on Erection. — The timbers to form the principals are assembled 

 and nailed, or bolted, together on the ground. One principal is put 

 together first, and then serves as a pattern or guide for use in coDstructiug 



