100lb. of PRUSSIA
The quintal is 110 lb.
The scheffel, a dry measure,
The eimer, a liquid measure,
The Prussian foot
The Prussian ell
The Prussian mile

100 lb. DENMARK, The centner is 100 lb. The shippond is 320 lb.

The bbl.or toende, a dry

110.28 lb. avoir's. = 110.28 lb. avoir's. 352.896 lb. meas.-3.9472 bushels, U. S.

The viertel, a liquid measure. =2.041 gallons, U. S:

The Danish or Rhineland
The Danish ell is 2 feet
The Danish mile

foot=12.356 inches, U. S. =24.712 inches, U. S. =4.684 miles, U. S.

70 lb. avoirdupois 192.5 lb. avoirdupois. 175 lb. avoirdupois.

The salma grossa, a dry measure, 9.77 bushels, U. S.

The salma generale

The salma, a liquid measure,
The palmo, a long measure,
The canna is 8 palmi

100 lb. of LEGHORN,
The sacco, a dry measure,
The barile, a liquid measure,
155 braccia, cloth measure,
The canna of 4 braccia

=7.85 bushels, U. S.

=23.06 gallons, U. S.
9.5 inches, U. S.
76 inches, U. S.

=

The mezzarola, liquid measure, 39.22 gallons. U. S.

100 lb. or 100 rottoli, MALTA,=174.5 lb. avoirdupois.

The cantaro, kintal, SMYRNA, 129.48 lb.avoirdupois.

A factory maund of BENGAL, =743 lb. avoirdupois.

The pecul of JAPAN,

=

82 lb. avoirdupois. = 18 inches, U. S. =1 yard U. S.

=

=133 lb. avoirdupois. of a pecul, 1.333 lb. avoirdupois. — 14.625 inches U. S.

=130 lb. avoirdupois

The catti is 100th part of a pecul, 1.3 lb. avoirdupois.

The inc or tattamy, long meas.

=

6.25 feet, U. S.

The bahar of BENCOOLEN, 560 lb. avoirdupois.

The bamboo, liquid measure,

The coyang is 800 bainboos

=

=1 gallon, U. S.

800 gallons, U. S.

XXXIX.

MENSURATION.

MENSURATION is the art or practice of measuring, and has primary reference to the measurement of superficies and solids.

Mensuration involves a knowledge of Geometry; and, as that science is not the object of this work, we shall confine our exercises under this head to those measurements, which are most likely to be useful in the ordinary concerns of life.

SUPERFICIES OR SURFACE.

It has already been taught, that surfaces are measured in squares, and that the area of any square figure, or any parallelogram is found by multiplying together the length and breadth of the figure. For observations on the square and parallelogram, see page 162.

AREA OF A RHOMBUS. A rhombus is a figure with four equal sides, having two of its angles greater, and two less than the angles of a square. The greater angles are called obtuse angles, and the smaller, acute angles.

To find the area of a rhombus, first drop a perpendicular from one of the obtuse angles to the opposite side, then multiply the side by the perpendicular.

1. How many square feet are there in a flooring, the form of which is that of a rhombus, measuring 15 feet on the side, and 12.5 feet in the perpendicular?

AREA OF A RHOMBOID. A rhomnoid is a figure with four sides, which are not all equal, but whose opposite sides are equal, and whose opposite angles are

V

equal, having, like a rhombus, two obtuse, and two acute angles. To find the area of a rhomboid, drop a perpendicular from one of the obtuse angles, to the opposite longer side, and multiply the longer side by the perpendicular. 2. What is the area of a rhomboid whose longer side is 18.75 feet, and whose perpendicular is 9.25 feet?

AREA OF TRIANGLES. It

is obvious, that a right-angled triangle contains just half as much surface as would be contained in a square or parallelogram, two of whose sides are formed by the base and perpen

dicular of the triangle. Therefore, the area of a rightangled triangle is found, by multiplying together either the base and half the perpendicular, or, the perpendicular and half the base.

3. How many square rods of land are there in a lot, which is laid out in a right-angled triangle, the base measuring 19 rods, and the perpendicular 15 rods?

4. How many acres of land in a lot, whose form is that of a right-angled triangle, the base measuring 113 rods, and the perpendicular 75 rods?

R

An Equilateral triangle is a triangle whose sides are all equal such is the first of the two triangles adjoined. An obtuse-angled triangle is that which has one obtuse angle -such is the second of the triangles adjoined. Whatever may be the form of a triangle, if it have not a right angle, it nust be cut into two rightangled triangles before it can be measured: and this is done by dropping a perpendicular from the opposite angle to the