104с

MINE TRACKS

THEIR LOCATION AND CONSTRUCTION

Treating Briefly on the Materials Used and the Principles Involved in the Design and Installation, with a Set of Rules for a Standard Practice

BY

McCRYSTLE, E. M.

First Edition Third Impression ,

McGRAW-HILL' BOOK COMPANY, Inc. NEW YORK: 370 SEVENTH AVENUE

LONDON: |(i & 8 BOUVERIK ST., K. C. 4

19 18