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SECOND AND ENLARGED EDITION NOW READY.

COTSWORTH'S

DIRECT CALCULATOR

Series 'O.R.' bound full leather, 45s.

Including RECIPROCAL Tables from 1 to 10,000,000. This work contains over 1,000,000 distinct results, and is now extensively used by persons requiring to make calculations of

MULTIPLICATION, DIVISION, AVERAGE, PERCENTAGE, INTEREST, EXCHANGE, SQUARE AND CUBE ROOT,

and General and Scientific Calculations of all combinations of numbers.

Multiplication of any three figures by any other three figures from 1 to 1,000 is seen at a glance.

Larger numbers being easily worked in groups of three figures.

Also in cloth, 35s.; without Reciprocal Tables, 25s.; these latter may also be had separately, price 12s. 6d.

RAILWAY and TRADERS' CALCULATOR.

Price 10s. 6d. By M. B. COTSWORTH.

(3rd Edition.)

FOR CHARGING or CHECKING ACCOUNTS.

Used by the leading Railway Companies and Traders. This work

SHOWS AT A GLANCE

Calculations of 24 rates at one opening of the book at ALL RATES from 1d. to 100s., advancing by a penny per ton for ALL WEIGHTS from 1 lb. to 1,000 TONS, including over 250,000 Direct Calculations, and other information.

WAGES CALCULATORS

50 Hours a Week at rates advancing by 6d., from 2s. 6d. to 40s., thence by Shillings to 45s. Price 5. by post, 5s. 4d.

521 Hours a Week at rates advancing by 6d., from 6d. to 60s. Royal 8vo. cloth. Price 38. 9d.; by post, 4s. 54 and 53 Hours per Week (to 81 hours), advancing by 1s. gradations with decimals for 1 hour at each rate, from 4s. to 50s. Crown oblong 4to. cloth. Price 2s.; by post, 2s. 3d.

48, 54, 60, 63, 66, and 72 Hours per Week at rates of 5s. to 36s. 6d. per week, advancing by 6d. gradations, with overtime at time and a quarter. Other pay at time and a half. Demy, cloth. Price 2s. 6d. each; or bound together in one volume, 7s. 6d. ; by post, 28. 74d. and 7s. 9d.

51 Hours per Week from 1 to 231 hours at rates of 2s. to 50s. per week, advancing by 3d. gradations to 8s., by 6d. to 20s., by shillings after. Crown 8vo. 2s. 6d. ; by post, 2s. 84d.

55 Hours per Week at rates advancing by 3d. to 10s. 6d., thence by 6d. to 42s. and by Shillings to 50s. Price 5s. 6d. post free.

49 Hours per Week to 40s.

HOURS Calculator, advancing by QUARTER HOURS to 60 hours and by FARTHINGS to 8d. per hour.
Demy, cloth. Price 4s. 6d. ; by post, 4s. 9d.

WAGES CARDS at 48, 53, 54, 60 hours per week at 5s. to 50s., advancing by gradations of 1s. to 10s., 6d. to 20s., 1s. to 36s., and 2s. 6d. to 50s. Price, 1s. 6d. ; by post, 1s. 9d. each.

EXCHANGE CARDS,

For converting TO and FROM British Equivalents.

KILOGRAMMES and TONS, cwts., qrs., lbs., at 1,016 kilos. per ton, also Transit at

1,015 per ton.

LITRES and GALLONS, and GALLONS, Quarts, and Pints (both on one card).
METRES and YARDS, and YARDS, Feet, and Inches.

RUSSIAN POODS and TONS, cwts., qrs., lbs. Russian POODS AND PFUND, and
TONS, cwts., qrs., lbs.

DOLLARS (at $4.80) and sterling.

reduced to lbs.

Reverse of card shows TONS, cwts., qrs., Ibs.

EXCHANGE Cards showing comparative values of Foreign Coins in decimals sterling.
Francs and Lire at 25 to 25.99 Francs, Milreas, Pesetas, Roubles, Rupees, Taels, Yen, Dollars; also
Austrian, Dutch, Scandinavian, and German currency at various rates.

Price 18. 6d. each, Pood Cards, 2s.; postage, 3d. extra.

Calculators and Ready Reckoners of all Kinds.

MOCORQUODALE & C

N STREET, LONDON, E.C.

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