[Sidenote: Tests.]

"13. (A) Two pieces shall be tested from each heat of steel. If
either of these test pieces breaks, a third piece shall be tested.
If two of the test pieces break without showing physical defect, all
rails of the heat will be rejected absolutely. If two of the test
pieces do not break, all rails of the heat will be accepted as No. 1
or No. 2 classification (according as the deflection is less or
more, respectively, than the prescribed limit[A]).

"(B) If, however, any test piece broken under test A shows physical
defect, the top rail from each ingot of that heat shall be rejected.

"(C) Additional tests shall then be made of test pieces selected by
the Inspector from the top end of any second rails of the same heat.
If two out of three of these second test pieces break, the remainder
of the rails of the heat will also be rejected. If two out of three
of these second test pieces do not break, the remainder of the rails
of the heat will be accepted, provided they conform to the other
requirements of these specifications, as No. 1 or No. 2
classification (according as the deflection is less or more,
respectively, than the prescribed limit[F]).

"(D) If any test piece, test A, does not break, but when nicked and
tested to destruction shows interior defect, the top rails from each
ingot of that heat shall be rejected.

[Sidenote: Drop testing machine.]