liver run of crusher stone; such stone is irregular and 

 full of dust. Screened stone should be insisted upon. 



The size of stone should be proportioned to the size 

 of the members in which the concrete is to be placed. 

 In columns, slabs and small beams the maximum size 

 of the stone should not run over ^ in- and the mini- 

 mum size should be approximately ^ in. In members 

 of larger proportions i%-'m. stone may be used and in 

 massive work 2-in. stone may be used and where per- 

 mitted rubble stone can be embedded in the concrete. 



Steel. Steel must comply with the specifications. 

 This applies equally to plain reinforcing rods and 

 built-up members. Each shipment, as it is received 

 should be checked over with the bills, assorted and 

 stored so that it can be got at as needed ; each portion 

 being so placed that the material needed first can be 

 got at without rehandling. This point is important. 

 The absence of marks on built-up members should be 

 reported promptly and such pieces should be laid aside, 

 if possible, so they can be marked upon receipt of 

 definite information. 



A thin film of rust on the steel is not objectionable. 

 Loose or scaly rust must be removed by the use of a 

 stiff wire brush. 



Steel must be free from oil or paint which will less- 

 en the adhesion of the concrete. 



The steel must be so braced and supported that the 

 placing of the concrete will not force it out of position 



The sizes and amount of reinforcing required for 

 each member is designated upon the drawings and the 

 inspector must see that this reinforcement is placed in 

 position correctly. No concrete must be placed until 

 the inspector has satisfied himself, by personal inspec- 

 tion, that this has been done. This inspection must 

 be made immediately before the concrete "is placed. 



Where bars are left protruding they should be pro- 

 tected from rusting by a coat of neat cement grout. 



In bending the bars the force must be gradually ap- 



