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2. Troy Weight 24 grains (gr.) make 1 penny-weight, marked 20 penny-weights, 1 ounce, 12 ounces,
prot OZ. Ib.
3. Avoirdupois Weight.
16 drams (dr.) make
Om 16 ounces,
Ib. 28 pounds, 1 quarter of a hundred weight,
qr. 4 quarters,
1 hundred weight, cut. 20 hundred weight,
T. By this weight are weighed all coarse and drossy goods, grocery wares, and all metals except gold and silver.
4. Apothecaries Weight. 20 grains (gr) make 1 scruple, 3 scruples,
3 8 drams,
3 12 ounces,
the Apothecast.es use this weight in compounding their medieines.
5. Cloth Measure.
4 nails (na) make 1 quarter of a yard, qr. 4 quarters,
yd. 3 quarters,
1 Ell Flemish,
E. FI. 5 quarters,
1 Ell English, E. E. 6 quarters,
1 Ell French,
E. Fr. 6. Dry Measure.
2 pints, (pt.) make
1 quart, 8 quarts,
pk. A pecks,
bu. This measure ts applied to grain, beans, flax-seed, sala Jals, oysters, coal, &c.
All brandies, spirits, mead, vinegar, oil, &c. are measured by wine measure. Note.--231 solid inches, make a gallon.
8. Long Measure.
3 barley corns (b. c.) make 1 inch, marked 12 inches,
ft. 3 feet,
yd. 5 yards,
1 rod, pole, or perch, rd. 40 rods,
fur. 8 furlongs,
1 mile, 3 miles,
lea. 69, statute miles,
1 degree, on the earth. 360 degrees, the circumference of the earth.
The use of long measure is to measure the distance of places, or any other thing, where length is considered, without regard to breadth,
N. B. In measuring the height of horses, 4 inches make 1 hand. In measuring depths, six feet make 1 fathom or French toise. Distances are measured by a chain, four rods iong, containing one hundred links
9. Land, or Square Measure.
1 square foot. 9 square feet,
1 square yard 301 square yards, or 2721 square feet,
rod. 40 square rods,
1 square rood. 4 square roods,
1 square acre. 640 square acres.
10. Solid, or Cubic Measure. 1728 solid inches make
1 solid foot. 40 feet of round timber, or 50 feet of hewn timber,
1 tun or load. 128 solid feet or 8 feet long,
1 cord of wood. 4 wide, and 4 high, All solids, or things that have length, breadth and depth. are measured by this measure. N. B. The wine gallon contains 231 solid or cubic inches, and the beer gallon, 282. A bushel contains 2150,42 solid inches.
11. Time. 60 seconds (S.) make 1 minute, marked M 60 minutes,
h. 24 hours,
d. 7 days,
1 week, 4 weeks,
1 month, 13 months, 1 day and 6 hours, 1 Julian year, yr. Thirty days hath September, April, June, and November, February twenty-eight alone, all the rest have thirty-one.
N. B. In bissextile, or leap year, February hath 29 days.
12. Circular Motion.
60 seconds (") make 1 minute, 60 minutes,
1 degree, 30 degrees,
S. 12 signs, or 360 degrees, the whole great circle of the
Explanation of Characters used in this Book.
Equal to, as 12d. = 1s. signifies that 12 pence are equal to 1 shilling.
+ Nfore, the sign of Addition, as 5+7=12, signifies that
5 and 7 added together, are equal to 12.
Minus, or less, the sign of Subtraction, as 0-2 =4, signifies that 2 subtracted from 6, leaves 4. x Multiply, or with, the sign of Multiplication ; as
4x3=12, signifies that 4 multiplied by 3, is equal to 12.
-:- The sign of Division ; as 8:2=4, signifies that 8 di
vided ly 2, is equal to 4 ; or thus, F1, each of which signify the same thing.
: Four points set in the middle of four numbers, denote them to be proportional to one another, by the rule of three ; as 2:4::8:16; that is, as 2 to 4, so is 8 to 16.
✓ Prefixed to any number, supposes that the square root
of that number is required.
✓ Prefixed to any number, supposes the cube root of that number is required. Denotes the biquadrate root, or fourth power, &c.
ARITHMETIC is the art of computing by numbers, and has five principal rules for its operation, viz, Numeration, Addition, Subtraction, Multiplication, and Division.
Numeration is the art of numbering. It teaches to exa press the value of any proposed number by the following characters, or figures :
1, 2, 3, 4, 5, 6, 7, 8, 9, Omorci pher. Besides the simple value of tigures, each has a local value, which depends upon the place it stands in, viz. any figure in the place of units, represents only its simple value, or so many ones, but in the second place, or
Note.- Although a ci pher standing alone signifies nothing; yet when it is placed on the right hand of fiyares, it increases their value in a tenfold proportion, by throwing them into higher places. Thus 2 with a cipher annexed to it, becomes 20, twenty, and with two ciphers, thus, 200), two hundred.
2. When numbers consisting of many figures, are given to be read, it will be found convenient to divide them into as many periods as we can, of six figures each, reckoning from the right hand towards the left, cal. ling the first the period of units, the second that of inillions, the third billions, the fourth trillions, &c. as in the following number:
8 0 7 3 6 2 5 4 6 2 7 8 9 0 1 2 5 0 6 792 4. Period of 3. Period of 2.
Period of 1. Period of
506792 The foregoing number is read thus-Eight thousand and seventy-three trillions; six hundred and twenty-five thousand, four hundred and sixty. two billions ; seven hundred and eighty-nine thousand and iwelve milLions; five hundred and six thousand seven hundred and ninety-two.
N. B. Billions is substituted for millions of millions.