IOLTB, in m \ 



17 



the tit liamfer U ju*t sufficient to touch I)H middle 



f the tide*, and in these CMM the dmwing of UM nut . 



Mill)'.' 1 



niibovn A bolt with A 



- head and a square nivk If this form of holt U t ...,. n 

 Ji a Mjuan I.-.-- the square neck prevents th- \->. 

 turning when tin- nut is being screwed up. Instead of a 



PI... is. n- 



I nsr, as showu 



on th- ruj. ln-.i-l.--l boll to a short 



groove cut m the side of the hole through whuli tl. 



