20 WORKS IN MATHEMATICS, ETC., 
Weights, Measures, Moneys, &e. 
MEASURES, WEIGHTS, and MONEYS of all NATIONS. 
Entirely New Edition, Revised and Enlarged. By W. S. B. 
WooLuHousE, F.R.A.S. 1I2mo, 2s. 6d. cloth boards. 
Compound Interest and Annuzties. 
THEORY of COMPOUND INTEREST and ANNUITIES ; 
with Tables of Logarithms for the more Difficylt Computations of 
Interest, Discount, Annuities, &c., in all their Applications and 
Uses for Mercantile and State Purposes. By Fi&por THOMAN, 
of the Société Crédit Mobilier, Paris. 3rd Edit., 12mo, 4s. 6d. cl. 
Ivon and Metal Trades Calculator. 
THE IRON AND METAL_.TRADES’) COMPANION: 
Being a Calculator containing a Series of Tables upon a new and 
comprehensive plan for expeditiously ascertaining the value of any 
ae bought or_sold by weight, from Is. per cwt. to 112s. per 
cwt., and from one farthing per Ib. to 1s. per Ib. Each Table ex- 
tends from one lb. to100 tons. By T. DOWNIE. 396 pp., 9s., leather. 
lron and Steel. 
IRON AND STEEL: a Work for the Forge, Foundry, 
Factory, and Office. Containing Information for Ironmasters and 
their Stocktakers ; Managers of Bar, Rail, Plate, and Sheet Rolling 
Mills ; Iron and Metal Founders ; Iron Ship and: Bridge Builders ; 
Mechanical, Mining, and Consulting Engineers ; Architects, Builders, 
&c. By CHARLES Hoare. Eighth Edit. Oblong 32mo, 6s., leather. 
Comprehensive Weight Calculator. 
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 1lb. to 15 tons, at 300 Pro- 
gressive Rates, from 1 Penny to 168 Shillings per cwt., and con- 
taining 186,000 Direct Answers, which, with their Combinations, 
consisting ofa single addition, will afford an ag ggregate of 10,266,000 
Answers ; the whole being calculated and designed to ensure’ 
Correctness and promote Despatch, By HENRY MHARBEN, 
Accountant. New Edition. Royal 8vo, 1/. 55., half-bound. 
Comprehensive Discount Guide. 
THE DISCOUNT GUIDE: comprising Tables for the use of 
Merchants, Manufacturers, Ir onmongers, and others, by which 
may be ascertained the exact profit arising from any mode of using 
Discounts, either in the Purchase or Sale of Goods, and the method 
of either Altering a Rate of Discount, or Advancing a Price, so as 
to produce, by one operation, a sum that will realise any required 
profit after allowing one or more Discounts: to which are added 
Tables of Profit or Advance from 1} to go per cent., Tables of 
Discount from 1} to 982 per cent., and Tables of Commission, &c., 
from § to 10 per cent. By H. HARBEN, 8vo, 1. 5s., half-bound. 
Mathematical Instruments. 
MATHEMATICAL INSTRUMENTS: Their Constructionj 
Adjustment, Testing, and Use; comprising Drawing, Measuring, 
Optical, Surveying, and Astronomical Instruments. By J. F 
HIEATHER, M.A, Enlarged Edition, 12mo, 5s. cloth. 
