79 



tilled with hot crtHJSiite and fraiiiing cultini^s should br well swal)t)t'd with it beiore 

 putting the parts into construction. All holes for ordinary- bolts or for pins should he 

 bored not larger in diameter than the bolt or pin, to insure a driving fit. This will 

 prevent borers from entering the Ixjlt holes, so far as it is possible to provide against it 

 (fig. 28). Where machine bolts are used, however, the hok 

 larger than the diameter of the bolt. 



siioukl be l)ored 'ig" 



Fig. 28. (1) Bolt hole in creosoted fender pile, enlarged by Limnona. 



(2) Creosoted pile, attacked within five years by Limnoria in a spot exposed by chopping. 



The Flooring System 



The flooring system is of sufficient importance to deserve more attention than is 



many times given to it. Timfjers for the flooring system should in all cases be as heavy 



as can be used within econoiuic cost. A careful study has convinced this Committee 



that, after all framing and other cutting has been done, it is both a most desirable and 



