14 CATALOGUE OF SCIENTIFIC BOOKS. 



Electricity: its Theory, Sources, and Applications. 



By J. T. Sprague, M.S.T.E. Second edition, revised and enlarged, with 

 numerous illustrations, crown 8vo, cloth, 15J. 



The Practice of Hand Turning in Wood, Ivory, Shell, 



etc., with Instructions for Turning such Work in Metal as may be required 

 in the Practice of Turning in Wood, Ivory, etc. ; also an. Appendix on 

 Ornamental Turning. (A book for beginners.) By Francis Campin. 

 Third edition, with wood engravings, crown 8vo, cloth, 6s. 

 Contents : 



On Lathes — Turning Tools— rTuming Wood — Drilling — Screw Cutting — Miscellaneous 

 Apparatus and Processes — ^Turning Particular Forms — Staining — Polishing — Spinning Metals 

 — Materials — Ornamental Turning, etc. 



Health and Comfort in House Building, or Ventila- 

 tion with Warm Air by Self-Acting Suction Power, with Review of the 

 mode of Calculating the Draught in Hot- Air Flues, and with some actual 

 Experiments. By J. Drysdale, M.D., and J. W. Hayward, M.D. 

 Second edition, with Supplement, with plates, demy 8vo, cloth, 7^-. bd. 



Treatise on Watchwork, Past and Present. By the 



Rev. H. L. Nelthropp, M.A., F.S.A. With 32 illustrations, crown 

 8vo, cloth, 6^. dd. 



Contents : 



Definitions of Words and Terms used in Watchwork — Tools — Time — Historical Sum- 

 mary — On Calculations of the Numbers for Wheels and Pinions ; their Proportional Sizes^ 

 Trains, etc. — Of Dial Wheels, or Motion Work — Length of Time of Going without Winding 

 up — The Verge — The Horizontal — The Duplex — The Lever — The Chronometer — Repeating 

 Watches — Keyless Watches — The Pendulum, or Spiral Spring — Compensation — Jewelling of 

 Pivot Holes — Clerkenwell — Fallacies of the Trade — Incapacity of Workmen — How to Choose 

 and U,se a Watch, etc. 



Notes in Mechanical Engineering. Compiled prin- 

 cipally for the. use of the Students attending the Classes on this subject at 

 the, City of London College. By Henry Adams, Mem. Inst. M.E., 

 Mem. Inst. C.E., Mem. Soc. of Engineers. Crown 8vo, cloth, 2,s. (yd. 



Algebra Self-Taught. By W. P. Higgs, M.A., 



D.Sc, LL.D., Assoc. Inst C.E., Author of ' A Handbook of the Diffe;r- 

 ential Calculus,' etc. Second edition, crown 8vo, cloth, 2s. 6d. 

 Contents : 



Symbols -and the Signs of Operation — The Equation and the Unknown Quantity — 

 Positive and Negative Quantities — Multiplica^on — Involution — Exponents — Negative Expo- 

 nents-^Roots, and the Use of Exponents as Logarithms — Logarithms — ^Tables of Logarithms 

 and Proportionate Parts — Transformation of System of Logarithms — Common Uses of 

 Common Logarithms — Compound Multiplication and the Binomial Theorem-r-Division, 

 Fractions,' and Ratio — Continued Proportion — ^The Series ^nd the Suntmation of the Series — 

 Limit of Series — Square and Cube Root^— Equations — List of Formulae, etc. 



Spons' Dictionary of Engineering,- Civil, Mechanical, 



Military, and Naval; with technical terms in, French, German, Italian, 

 and Spanish, 3100 pp., and nearly 8000 fngravings, in super-royal 8vo, 

 in 8 divisions, 5/. %s. Complete in 3 vols., cloth; 5/. Jj. . Bound in a 

 superior manner, half-morocco, top edge gilt, 3 vols., 6/. \2s. 



