NOTES ON ERECTION 



59 



all the others of the same span and type. Bolting is superior to nailing, 

 and should therefore be used for at least the larger sizes of principals. 

 Bolts § inch in diameter are generally employed. 



SCPWTL/MCS /?LL 9' '* /£' ' £XC£PT STRUTS 

 WHICH fl/?£ G'x/l£ 



Sp/7a/ 30 to 38 Fczr. 

 Fig. 59. 



Corrugated galvanised iron is procurable in sheets a little more than 

 2 feet wide, and of lengths from 5 feet, increasing by increments of 1 foot, 



