[FOREIGN EXCHANGE.]

English Prices with Russian Equivalents (at Fourteen Rates of Exchange). English prices per lb., with equivalents in roubles and kopecks per pood. By A. Adiassewich. 182 pp. fcap. 32mo, roan. (1908)
net 10
English Prices with German Equivalents (at Seven Rates of Exchange). English prices per lb., with equivalents in marks per kilogramme. By St. Koczorowski. 95 pp. fcap. 32mo, roan. (1909)
net 10
English Prices with Spanish Equivalents. At Seven Rates of Exchange. English prices per lb., with equivalents in pesetas per kilogramme. By S. Lambert. 95 pp. 32mo, roan. (1910)
net 10
English Prices with French Equivalents (at Seven Rates of Exchange). English prices per lb. to francs per kilogramme. By H. P. McCartney. 97 pp. 32mo, roan. (1907)
net 10
Principles of Foreign Exchange. By E. Matheson. Fourth edition, 54 pp. 8vo, sewed. (1905)
net 03

[GAS AND OIL ENGINES.]

The Theory of the Gas Engine. By D. Clerk. Edited by F. E. Idell. Third edition, 19 illus. 180 pp. 18mo, boards. (New York, 1903)
net 20
Electrical Ignition for Internal Combustion Engines. By M. A. Codd. 109 illus. 163 pp. crown 8vo. (1911)
net 30
The Design and Construction of Oil Engines. By A. H. Goldingham. Third edition, 112 illus. 260 pp. crown 8vo. (New York, 1910)
net 106
Gas Engine in Principle and Practice. By A. H. Goldingham. New Impression. 107 illus. 195 pp. 8vo. (New York, 1912)
net 66
Practical Hand-Book on the Care and Management of Gas Engines. By G. Lieckfeld. Third edition, square 16mo. (New York, 1896)
36
Elements of Gas Engine Design. By S. A. Moss. 197 pp. 18mo, boards. (New York, 1907)
net 20
Gas and Petroleum Engines. A Manual for Students and Engineers. By Prof. W. Robinson. (Finsbury Technical Manual.) Third edition in preparation

[GAS LIGHTING.]

Gas Analyst's Manual (incorporating Hartley's “Gas Analyst's Manual” and “Gas Measurement”). By J. Abady. 102 illus. 576 pp. demy 8vo. (1902)
net 180
Gas Works: their Arrangement, Construction, Plant and Machinery. By F. Colyer. 31 folding plates, 134 pp. 8vo. (1884)
net 86
Transactions of the Institution of Gas Engineers. Edited by Walter T. Dunn, Secretary. Published annually. 8vo
net 106
Lighting by Acetylene. By F. Dye. 75 illus. 200 pp. crown 8vo. (1902)
net 60
A Comparison of the English and French Methods of Ascertaining the Illuminating Power of Coal Gas. By A. J. Van Eijndhoven. Illustrated, crown 8vo. (1897)
40
Gas Lighting and Gas Fitting. By W. P. Gerhard. Second edition, 190 pp. 18mo, boards. (New York, 1894)
net 20
A Treatise on the Comparative Commercial Values of Gas Coals and Cannels. By D. A. Graham. 3 plates, 100 pp. 8vo. (1882)
46
The Gas Engineers Laboratory Handbook. By J. Hornby. Third edition, revised, 70 illus. 330 pp. crown 8vo. (1911)
net 60

[HISTORICAL AND BIOGRAPHICAL.]

Extracts from the Private Letters of the late Sir William Fothergill Cooke, 1836-9, relating to the Invention and Development of the Electric Telegraph; also a Memoir by Latimer Clark. Edited by F. H. Webb, Sec. Inst. E.E. 8vo. (1895)
30
A Chronology of Inland Navigation in Great Britain. By H. R. De Salis. Crown 8vo. (1897)
46
A History of Electric Telegraphy to the year 1837. By J. J. Fahie. 35 illus. 542 pp. crown 8vo. (1889)
20
History and Development of Steam Locomotion on Common Roads. By W. Fletcher. 109 illus. 288 pp. 8vo.
50
Life as an Engineer: its Lights, Shades, and Prospects. By J. W. C. Haldane. New edition, 23 plates, 390 pp. crown 8vo. (1910)
net 50
Philipp Reis, Inventor of the Telephone: a Biographical Sketch. By Prof. S. P. Thompson. 8vo, cloth. (1883)
76
The Development of the Mercurial Air Pump. By Prof. S. P. Thompson. Illustrated, royal 8vo, sewed. (1888)
16

[HOROLOGY.]

Watch and Clock Maker's Handbook, Dictionary and Guide. By F. J. Britten. Tenth edition, 450 illus. 492 pp. crown 8vo. (1902)
net 50
The Springing and Adjusting of Watches. By F. J. Britten. 75 illus. 152 pp. crown 8vo. (1898)
net 30
Prize Essay on the Balance Spring and its Isochronal Adjustments. By M. Immisch. 7 illus. 50 pp. crown 8vo. (1872)
26