Prize Essay on the Balance Spring and its Isochronal Adjustments. By M. Immisch. 7 illus., 50 pp., crown 8vo. (1872.) 2s. 6d.

HYDRAULICS AND HYDRAULIC MACHINERY

(See also Irrigation and Water Supply.)

Hydraulics with Working Tables. By E. S. Bellasis. Second edition, 160 illus., xii + 311 pp., 8vo. (1911.) 12s. net.

Pumps: Historically, Theoretically and Practically Considered. By P. R. Björling. Second edition, 156 illus., 234 pp., crown 8vo. (1895.) 7s. 6d.

Pump Details. By P. R. Björling. 278 illus., 211 pp., crown 8vo. (1892.) 7s. 6d.

Pumps and Pump Motors: A Manual for the use of Hydraulic Engineers. By P. R. Björling. Two vols., 261 plates, 369 pp., royal 4to. (1895.) £1 10s. net.

Practical Handbook on Pump Construction. By P. R. Björling. Second ed., new imp., 9 plates, viii + 86 pp., cr. 8vo. (1912.) 3s. 6d. net.

Water or Hydraulic Motors. By P. R. Björling. 206 illus., 287 pp., crown 8vo. (1903.) 9s.