PUBLISHED BY CROSBY LOCKWOOD & CO. 21 



MATHEMATICS, &c. 



♦ 



Gregory S Practical Mathematics, 



MATHEMATICS for PRACTICAL MEN ; being a Common- 

 place Book of Pure and Mixed Mathematics. Designed chiefly 

 for the Use of Civil Engineers, Architects, and Surveyors. Part 1. 

 Pure Mathematics — comprising Arithmetic, Algebra, Geometr}^, 

 Mensuration, Trigonometry, Conic Sections, Properties of Curves. 

 Part II. Mixed Mathematics — comprising Mechanics in general, 

 Statics, Dynamics, Hydrostatics, Hydrodynamics, Pneumatics, 

 Mechanical Agents, Strength of Materials. With an Appendix of 

 copious Logarithmic and other Tables. By Olinthus Gregory, 

 LL. D. , F.R. A. S. Enlarged by Henry Law, C. E. 4th Edition, 

 carefully revised and corrected by J. R. Young, formerly Profes- 

 sor of Mathematics, Belfast College ; Author of ** A Course of 

 Mathematics," &c. With 13 Plates. Medium 8vo, i/. i^. cloth. 



** As a standard work on mathematics it has not been excelled." — Artizan. 



*' The engineer or architect will here find ready to his hand, rules for solving nearly 

 every mathematical difficulty that may arise in his practice. The rules are in all cases 

 explained by means of examples, in which every step of the process is clearly worked 

 out." — Builder. 



**One of the most serviceable books to the practical mechanics of the country. 



In the edition just brought out, the work has again been revised by 



Professor Young. He has modernised the notation throughout, introduced a few 

 paragraphs here and there, and corrected the numerous typographical errors which 

 have escaped the eyes of the former Editor. The book is now as complete as it is 

 possible to make it. It is an instructive book for the student, and a Text- 

 book for him who having once mastered the subjects it treats of, needs occasionally to 

 refresh his memory upon them." — Building News, 



The Metric System. 



A SERIES OF METRIC TABLES, in which the British 

 Standard Measures and Weights are compared with those of the 

 Metric System at present in use on the Continent. By C. H. 

 DowLiNG, C. E. Second Edition, revised and enlarged. 8vo, 

 lOj. ^d. strongly bound. 



**Mr. Dowling's Tables, which are well put together, come just in time as a ready 

 reckoner for the conversion of one system into the other." — Athenœum. 



"Their accuracy has been certified by Prof. Airy, Astronomer- Royal. "— i5?<z'Z^^r. 



** Resolution 8. — That advantage will be derived from the recent publication oi 

 Metric Tables, by C. H. Dowling, Ç,.'^"— Report of Section F ^ Brit. Assoc., Bath. 



Comprehensive Weight Calctdator, 



THE WEIGHT CALCULATOR; being a Series of Tables 

 upon a New and Comprehensive Plan, exhibiting at one Reference 

 the exact Value of any Weight from lib. to 15 tons, at 300 Pro- 

 gressive Rates, from i Penny to 168 Shillings per cwt., and con- 

 taining 186,000 Direct Answers, which with their Combinations, 

 consisting of a single addition (mostly to be performed at sight), 

 will afford an aggregate of 10,266,000 Answers ; the whole being 

 calculated and designed to ensure Correctness and promote 

 Despatch. By Henrv Harben, Accountant, Sheffield, Author 

 of 'The Discount Guide.' An entirely New Edition, carefully 

 revised. Royal 8vo, strongly half-bound, 30^-. 



