14 CATALOGUE OF SCIENTIFIC BOOKS. 



The Assayers Manual: an Abridged Treatise on 



the Docimastic Examination of Ores and Furnace and other Artificial 

 Products. By BRUNO KERL. Translated by W. T. BRANNT. With 65 

 illustrations^ 8vo, cloth, izs. 6d, 



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, i$s. 



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 Svo, cloth, 6s. 



CONTENTS : 



On Lathes Turning Tools Turning Wood Drilling Screw Cutting Miscellaneous 

 Apparatus and Processes Turning Particular Forms Staining Polishing Spinning Metals 

 Materials Ornamental Turning, etc. 



Treatise on Watchwork, Past and Present. By the 



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

 Svo, cloth, 6s. 6d. 



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 Use a Watch, etc. 



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



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

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



CONTENTS : 



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

 Positive and Negative Quantities Multiplication 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 Division, 

 Fractions, and Ratio Continued Proportion The Series and the Summation of the Series- 

 Limit of Series Square and Cube Roots 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 engravings, in super-royal Svo, 

 in 8 divisions, 5/. 8s. Complete in 3 vols., cloth, 5/. 5.5-. Bound in a 

 superior manner, half-morocco, top edge gilt, 3 vob., 61. 12s. 



