1 qr. 5=1

1 yd. 3=1

and a

This measure is used for all kinds of Cloth
Nail, being a sixteenth part of 1 yard or of 36 inches, is
therefore equal to 2 inches. An Ell is 5 quarters in
England, but the Flemish and French Ells are nearly
equal to 3 and 6 English quarters respectively.

To these the following table may be annexed, as
exhibiting the magnitudes of certain measures frequently
mentioned in books, and used on particular occasions.

A Link, being one hundredth part of a Chain, is 7 inches, and a Geographical Mile is one sixtieth part of a Degree.

A Barleycorn or Grain of Barley is supposed to have been the original Element of Lineal Measure, in the same manner as a Grain of Wheat gave rise to the name of the Element of Weight.

V. TABLE OF SUPERFICIAL MEASURE.

A Square Inch is written 1 sq. in. or 1 in.

144 Square Inches are 1 Square Foot, 1 sq. ft. or 1 ft.
9 Square Feet ... 1 Square Yard, 1 sq. yd. or 1 yd.
30 Square Yards
1 Square Pole, 1 sq. po. or 1 po.

A square rod of 2724 square feet is used in estimating Bricklayers' work: and a square of Flooring, Roofing, &c., is 100 square feet. See Article (190), &c.

Also, 1210 sq. yds. or 25000 sq. links = 1 Rood:
4840 sq. yds. or 100000 sq. links

See Article (206).

= 1 Acre.

VI. TABLE OF SOLID MEASure.

A Cubic Inch is written 1 cu. in. or 1 in. 1728 Cubic Inches are 1 Cubic Foot

27 Cubic Feet.

1 ft.

Also, a load of rough timber is 40 cubic feet; a load of squared timber is 50 cubic feet, and a ton of Shipping is 42 cubic feet. See Article (195), &c.

By means of this measure all liquids, corn, seeds, lime, &c., are estimated according to the multiples in the following tables. See Article (209).

A Sack of Flour is such a quantity as weighs 20 stone or 280 lbs., and is generally about 5 imperial Bushels. See Article (209).

This table is of little use, as Coals are now generally sold by weight. See Article (209).

VIII. TABLE OF MEASURE OF TIME.

A Second is written 1 sec. or 1".

On some occasions 28 days, which is nearly a Lunar Month, are called a Month: and a common year consists of 12 Calendar Months, or, of 12 Average Months of 30 days, nearly: or of 365 days, 6 hours, or of 52 weeks, 1 day, 6 hours, or of 13 months, 1 day, 6 hours, nearly, the odd day and hours being omitted in practice: and the numbers of days in the Calendar Months are usually recollected by means of the following lines.

Thirty days have September,
April, June and November:
February twenty-eight alone:

And all the rest have thirty-one ;

Except in Leap-year, and then is the time,
When February's days are twenty-nine.

For an Account of the Calendar, see Article (214), &c.

There are also denominations below seconds, called thirds, fourths, &c., each being one sixtieth part of that which precedes it; but they are generally expressed decimally as parts of a Second. See Article (213,

A long hundred is 120; a great gross is 144 dozen: but these, and several other denominations of a similar kind are rapidly going out of use.

The Student will consult his own advantage and convenience by committing these ten tables to memory, omitting such of the Observations as may depend upon principles beyond the extent of his progress in the subject.