674 CEMENTS, LIMES, AND PLASTERS. 



When the ramming has been completed the surplus cement shall be 

 struck off and the final layer smoothed with a trowel held almost hori- 

 zontal and drawn back with sufficient pressure to make its edge follow 

 the surface of the mould. 



(14) The above are to be considered the minimum requirements. 

 Unless a cement has been recently used on a work under this office, 

 bidders will deliver a sample barrel for test before the opening of bids. 

 If this sample shows higher tests than those given above, the average 

 of tests made on subsequent shipments must come up to those found 

 with the sample. 



(15) A cement may be rejected in case it fails to meet any of the 

 above requirements. An agent of the contractor may be present at 

 the making of the tests, or, in case of the failure of any of them, they 

 may be repeated in his presence. If the contractor so desires the engi- 

 neer officer in charge may, if he deems it to the interest of the United 

 States, have any or all of the tests made or repeated at some recog- 

 nized testing laboratory in the manner herein specified, all expenses of 

 such tests to be paid by the contractor. All such tests shall be made 

 on samples furnished by the engineer officer from cement actually delivered 

 to him. 



