ck.

The average drill performance was about 33 lin. ft. per 8-hour shift.

The average number of cubic yards of excavation per drill shift was 13.9.

The average number of feet of drilling per cubic yard of excavation was
about 2.4.

The average excavation per pound of dynamite was 2.2 cu. yd.

The average amount of excavation per derrick shift of ten hours, 87% of the
excavation being rock, was 50 cu. yd.

The average derrick force per shift, including only foreman and laborers,
was 13 men.

The salaries of the engineering staff in the field and the expenses of
equipping and maintaining the field office amounted to 2.8% of the cost of
the work executed, 2.7% being for engineering salaries alone.

FOOTNOTES:

[Footnote A: Presented at the meeting of April 6th, 1910.]

End of the Project Gutenberg EBook of Transactions of the American Society
of Civil Engineers, vol. LXVIII, Sept. 1910, by B.F. Cresson, Jr

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