Bricklayers' Work.

EXAMPLES.

1. The height of a cistern is 10 feet, what must be its diameter that it may contain 40 hogsheads?

Ans. 78,6 inches, nearly.

10. If the diameter of a cistern be given, and it is required to find the height so that the cistern shall contain a given number of hogsheads, we have the following

RULE.

1st. Reduce the content to cubic inches.

2d. Reduce the diameter to inches, and then multiply its square by the decimal ,7854.

3d. Divide the content by the last result and the quotient will be the height in inches.

EXAMPLES.

1. The diameter of a cistern is 8 feet: what must be

its height that it may contain 150 hogsheads.

Ans. 25 ft. 1 in. nearly.

QUEST.-10. If the diameter be known, how will you find the height, so

that the cistern shall contain a given quantity ?

Masons' Work.

SECTION IV.

MASONS' WORK.

1. To masonry belong all sorts of stone work. The measure made use of is either superficial or solid.

2. Walls, columns, blocks of stone or marble, are measured by the cubic foot; and pavements, slabs, chimney pieces, etc. are measured by the square or superficial foot. Cubic or solid measure is always used for the materials, and the square measure is sometimes used for the workmanship.

EXAMPLES.

1. Required the solid content of a wall 53 feet 6 inches long, 12 feet 3 inches high, and 2 feet thick? Ans. 1310 feet.

2. What is the solid content of a wall the length of which is 24 feet 3 inches, height 10 feet 9 inches, and thickness 2 feet?

Ans. 521,375 feet.

3. In a chimney piece we find the following dimensions :

Length of the mantel and slab,

Breadth of both together,

Length of each jamb,

Breadth of both,

Required the superficial content.

4 feet, 2 inches.

3 66 2 66

4

4

1

9

35

Ans. 21 feet, 10'.

Carpenters' and Joiners' Work.

SECTION V.

CARPENTERS AND JOINERS' WORK.

1. Carpenter's and joiner's work is that of flooring, roofing, &c., and is generally measured by the square of 100 square feet.

2. In carpentry, a roof is said to have a true pitch when the length of the rafters is three-fourths the breadth of the building. The rafters then, are nearly at right angles. It is therefore customary to take once and a half times the area of the flat of the building, for the area of the roof.

EXAMPLES.

1. How many squares, of 100 square feet each, in a floor 48 feet 6 inches long, and 24 feet 3 inches broad? Ans. 11 and 761 sq. ft.

2. A floor is 36 feet 3 inches long, and 16 feet 6 inches broad: how many squares does it contain?

Ans. 5 and 981 sq. ft.

3. How many squares are there in a partition 91 feet 9 inches long, and 11 feet 3 inches high?

Ans. 10 and 32 sq. ft.

4. If a house measure within the walls 52 feet 8 inches in length, and 30 feet 6 inches in breadth, and

Slaters' and Tilers' Work.

the roof be of the true pitch, what will the roofing cost

at $1,40 per square?

Ans. $33,733.

SECTION VI.

SLATERS' AND TILERS' WORK.

1. In this work, the content of the roof is found by multiplying the length of the ridge by the girt from eaves to eaves. Allowances, however, must be made for the double rows of slate at the bottom.

EXAMPLES.

1. The length of a slated roof is 45 feet 9 inches, and its girt 34 feet 3 inches; what is its content?

Ans. 1566,9375 sq. ft.

2. What will the tiling of a barn cost, at $3,40 per square of 100 feet, the length being 43 feet 10 inches, and breadth 27 feet 5 inches, on the flat, the eave board projecting 16 inches on each side, and the roof being of the true pitch?

Ans. $65,26.

Plasterers' Work

SECTION VII.

PLASTERERS' WORK.

1. Plasterers' work is of two kinds, viz.: ceiling, which is plastering on laths; and rendering, which is plastering on walls. These are measured separately.

2. The contents are estimated either by the square foot, the square yard, or by the square of 100 feet.

Inriched mouldings, &c., are rated by the running or lineal measure.

In estimating plastering, deductions are made for chimneys, doors, windows, &c.

EXAMPLES.

1. How many square yards are contained in a ceiling 43 feet 3 inches long, and 25 feet 6 inches broad?

Ans. 1221 nearly.

2. What is the cost of ceiling a room 21 feet 8 inches, by 14 feet 10 inches, at 18 cents per square yard?

Ans. $6,421.

3. The length of a room is 14 feet 5 inches, breadth 13 feet 2 inches, and height to the under side of the cornice 9 feet 3 inches. The cornice girts 8 inches, and projects 5 inches from the wall on the upper part next