Εικόνες σελίδας
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Ηλεκτρ. έκδοση
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For Subtraction, read thus:-2 from 3 leaves 1; 2 from 4, 2, &c.

24

14 12

10

15

12

[ocr errors]

11

22

23

16 12

12

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12

96 12

108 12

100 10
110 11
120 12

108

110

10

121

11

132

12

120 132

144

Read reversely for Division, thus:-2 into 2 once, into 4 twice, &c.

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: is to

:: so is

: to

signifies Proportion, as 1 : 2 :: 3:6 These figures are thus read, as 1 is to 2 so is 3 to 6. marks the Square root, as √4=2.

marks the Cube root, as 3/8=2.

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£ denotes pounds, s. shillings, and d. pence.
one farthing, or one quarter of anything.
a halfpenny, or a half of anything.

...

three farthings, or three-quarters of anything.

[blocks in formation]

14 pounds make one stone, and 8 stone 1 hundredweight.

This weight is used or bread, meat, grocery, for goods in general, and for all the metals except gold and silver.

[blocks in formation]

This weight is used for gold, silver, jewels, and liquors.

[blocks in formation]

Apothecaries use this weight in mixing their medicines; but

they buy and sell by avoirdupois weight.

[blocks in formation]

360 degrees

= the earth's circumference.

An inch is supposed to be equal to three barley-corns in length. Eleven miles Irish are equal to fourteen miles English. 4 inches make one hand, used in measuring horses.

[blocks in formation]

The Flemish ell is three quarters of a yard; the English ell 5 quarters of a yard; and the French ell 6 quarters of a yard.

[blocks in formation]

The squares of any number is obtained by multiplying it by

itself, 12 multiplied by 12

1728 cubic inches

27 cubic feet

=

144, the square of 12.

CUBIC, OR SOLID MEASURE.

40 cubic feet of rough timber, or
50 cubic feet of hewn timber

42 cubic feet

[blocks in formation]

}

= 1 ton, or load.

= 1 ton of shipping.

A cube is a solid figure, similar to dice, and has six equal sides. The cube of any number is obtained by multiplying it twice by itself-thus, 12 x 12 x 12 1728, the cube of 12

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