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THE

COAL MINERS' POCKETBOOK

McGraw-Hill Book Company

Publishers of Books for

Electrical World The Engineering and Mining Journal Engineering Record Engineering News Railway Age Gazette

American Machinist Signal Engineer

American Engineer Electric Railway Journal Metallurgical and Chemical Engineering Power

Coal Age

COAL MINERS'
POCKETBOOK

FORMERLY THE
COAL AND METAL MINERS' POCKETBOOK

PRINCIPLES, RULES,
FORMULAS AND TABLES

ELEVENTH EDITION

REVISED, ENLARGED, AND ENTIRELY RESET

McGRAW-HILL BOOK COMPANY, INC.

239 WEST 39TH STREET. NEW YORK

LONDON: HLL PUBLISHING CO., LTD.
6 & 8 BOUVERIE ST., E. C.

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