The Theory and Practice of Model Aeroplaning Part 29

=Electricity Simplified.= By T.O. SLOANE. Tenth edition, 29 illus. 158 pp. crown 8vo. (_New York, 1901_)

_net_ 4 6

=How to become a Successful Electrician.= By T.O. SLOANE. Third edition, ill.u.s.trated, crown 8vo. (_New York, 1899_)

_net_ 4 6

=Electricity:= its Theory, Sources and Applications. By J.T. SPRAGUE.

Third edition, 109 illus. 658 pp. crown 8vo. (_1892_)

_net_ 7 6

=Telegraphic Connections.= By C. THOM and W.H. JONES. 20 plates, 59 pp. oblong 8vo. (_New York, 1892_)

_net_ 3 6

=Rontgen Rays= and Phenomena of the Anode and Cathode. By E.P.

THOMPSON and W.A. ANTHONY. 105 illus. 204 pp. 8vo. (_New York, 1896_)

_net_ 4 6

=Dynamo Electric Machinery.= By Prof. S.P. THOMPSON. Seventh edition, demy 8vo. (FINSBURY TECHNICAL MANUAL.)

Vol. I. =Continuous-Current Machinery.= With 4 coloured and 30 folding plates, 573 illus. 984 pp. (_1904_)

_net_ 1 10 0

Vol. II. =Alternating Current Machinery.= 15 coloured and 24 folding plates, 546 illus. 900 pp. (_1905_)

_net_ 1 10 0

=Design of Dynamos= (Continuous Currents). By Prof. S.P. THOMPSON. 4 coloured and 8 folding plates, 243 pp. demy 8vo. (_1903_)

_net_ 12 0

=Schedule for Dynamo Design,= issued with the above. 6_d_. each, 4_s_.

per doz., or 18_s_. per 100 _net_

=Curves of Magnetic Data for Various Materials.= A reprint on transparent paper for office use of Plate L from Dynamo Electric Machinery, and measuring 25 in. by 16 in.

_net_ 0 7

=The Electromagnet.= By C.R. UNDERHILL. 67 illus. 159 pp. crown 8vo.

(_New York, 1903_)

_net_ 6 6

=Practical Guide to the Testing of Insulated Wires and Cables.= By H.L. WEBB. Fifth edition, 38 illus. 118 pp. crown 8vo. (_New York, 1902_)

_net_ 4 6

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. ADIa.s.sEWICH. 182 pp. fcap. 32mo, roan.

(_1908_)

_net_ 1 0

=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_ 1 0

=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_ 1 0

=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_ 1 0

=Principles of Foreign Exchange.= By E. MATHESON. Fourth edition, 54 pp. 8vo, sewed. (_1905_)

_net_ 0 3

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_ 2 0

=The Design and Construction of Oil Engines.= By A.H. GOLDINGHAM.

Third edition, 112 illus. 260 pp. crown 8vo. (_New York, 1910_)

_net_ 10 6

=Gas Engine in Principle and Practice.= By A.H. GOLDINGHAM. 107 illus.

195 pp. 8vo, cloth. (_New York, 1907_)

_net_ 6 6

=Practical Hand-Book on the Care and Management of Gas Engines.= By G. LIECKFELD. Third edition, square 16mo. (_New York, 1896_)