Lots for testing shall not exceed twenty (20) tons in weight; and plates rolled in universal mill or in grooves, or sheared plates, shall each constitute a separate lot, as shall also the angles, channels, or beams.

TESTS OF FULL-SIZED EYE-BARS.

Full-sized eye-bars may be tested to destruction, provided notice be given in advance of the number and size required for this purpose, so that the material can be rolled at the same time as that required for the structure. The number of tests of full-sized eye-bars will depend upon the size of the order and upon the regularity of the results of the tests. In general, for small orders, the number of tests shall be about three (3) per cent of the number of eye-bars in the order, but never less than two bars for an order for a single span. For large orders the number of tests shall be about two (2) per cent of the number of eye-bars in the order. Should the Inspector find the bars to be very uniform in strength, elasticity, and ductility, and fully up to the specifications, he will be at liberty to reduce the number of tests of full-sized bars. In the case of testing long bars, it will be allowable to choose a bar at random from a number of finished bars, cut it in two, and upset the cut end of each piece, thus making two test-bars.

Full-sized bars of medium steel must show an ultimate tensile strength of at least fifty-six thousand (56,000) pounds per square inch. The elongation shall not be less than fourteen (14) per cent in a gauged length of ten (10) feet; and the elastic limit shall not be less than fifty (50) per cent of the ultimate strength of the bar.

For high steel the limits just specified shall be changed as follows:

Ultimate strength, 65,000 pounds.

Elongation, twelve (12) per cent.

Elastic limit, fifty (50) per cent.