THE matter in this book is confined chiefly to tunnels and adits for mining purposes, and includes also those used to carry water for power, irrigation, and domestic use. Such tunnels are driven generally through fairly hard rock. Some cross-sections of typical tunnels are given, and extensive bibliographies are supplied which will be of assistance to the engineer responsible for the design of a tunnel. The bulk of the book, however, is taken up with descriptions of methods of executing tunnels. The authors are evidently experts in such work, and give capital discussions on such subjects as the choice of power for tunnel work, air compressors, ventilation, rock-drills, haulage, blasting, and timbering.
Modern Tunneling: with Special Reference to Mine and Water-supply Tunnels.
By D. W. Brunton J. A. Davis. Pp. vi + 450. (New York: John Wiley and Sons; London: Chapman and Hall, Ltd., 1914.) Price 15s. net.