08 for Bessemer steel, or 0.03 for
Open-Hearth steel.
"The percentage of carbon in an entire order of rails shall average
as high as the mean percentage between the upper and lower limits.
[Sidenote: Shearing.]
"4. The end of the bloom formed from the top of the ingot shall be
sheared until the entire face shows sound metal.
"All metal from the top of the ingot, whether made from the bloom or
the rail, is the top discard.
[Sidenote: Shrink]
"5. The number of passes and speed of train shall be so regulated
that, on leaving the rolls at the final pass, the temperature of the
rails will not exceed that which requires a shrinkage allowance at
the hot saws, for a 33-ft. rail of 100 lb. section, of 6-1/2 in. for
thick base sections and 6-3/4 in. for A. S. CC. E. sections, and 1/8
in. less for each ten pounds decrease of section, these allowances
to be decreased at the rate of 1-100 in. for each second of time
elapsed between the rail leaving the finishing rolls and being
sawed.
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