PROCEEDINGS OF SECTION J. 723 
capable of bending sharply to a right angle at a working heat 
without sign of fracture. 
8. All rivet-iron must be tough and soft, and pieces the full 
diameter of the rivet must be capable of bending cold until the 
sides are in close contact without sign of fracture on the convex 
side of the curve. 
9. Alliron specified in clause 4 must bend cold 180 degrees, 
without sign of fracture, to a curve, the inner radius of which 
equals the thickness of the piece tested. 
10. Specimens of full thickness, cut from plate-iron, or from 
flanges or webs of shaped-iron, must stand bending cold through 
90 degrees to a curve, the inner radius of which is one and a half 
times its thickness, without sign of fracture. 
11. For each contract four standard test-pieces, and one 
additional for each 50,000 lbs. of wrought-iron, will, if required, be 
furnished and tested by the contractor without charge, and if 
any additional tests are required by the purchaser they will be 
made for him at the rate of five dollars each ; or, if the contractor 
desires additional tests, they shall be made at his own expense, 
under the supervision of the purchaser, the quality of the material 
to be determined by the result of all the tests in the manner set 
forth in the following clause. 
12. The respective requirements stated are for an average of 
the tests for each, and the lot of bars or plates from which samples 
were selected shall be accepted if the tests give such average 
results ; but if any test-piece gives results more than 4 per cent. 
below the requirements, the particular bar from which it was 
taken may be rejected, but such test shall be included in making 
the average. If any test-piece has a manifest flaw its test shall 
not be considered.. For each bar thus giving results more than 
4 per cent. below the requirements, tests from two additional bars 
shall be furnished by the contractor without charge, and if in a 
total of not more than ten tests, two bars (or for a larger number 
of tests a proportionately greater number of bars) show results 
more than 4 per cent. below the requirements, it shall be cause 
for rejecting the lot from which the sample-bars were taken. 
Such lots shall not exceed 20 tons in weight, and bars of a single 
pattern, plates rolled in universal-mill or in grooves, and sheared- 
plates, shall each constitute a separate lot. 
13. The inspection and tests of the material will be made 
promptly on its being rolled, and the quality determined before 
it leaves the rolling-mill. All necessary facilities for this purpose 
shall be afforded by the manufacturer; but if the inspector is 
not present to make the necessary tests, after due notice given 
him, then the contractor shall proceed to make such number of tests 
of the iron then being rolled as may have been agreed upon ; or, in 
absence of any special agreement, the number provided for in clause 
11, and the quality of such material shall be determined thereby. 
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