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7. What will the wainscoting of a room cost at 4s. per square yard; the height of the room, including cornice and the mouldings, is 12 feet and the compass 125 feet; there are three window shutters, each 7 feet 8 inches by 3 feet, and the door 7 feet by 3 feet; the door and shutters, being worked on both sides, are reckoned half work additional? Ans. £36 0s. 6d.

SLATERS' AND TILERS' WORK.

In these articles, the content of a roof is found by multiplying the length of the ridge by the girt over from eaves to eaves; making allowance in this girt for the double row of slates at the bottom, or for how much one row of slates or tiles is laid over another.

When the roof is of a true pitch, that is, forming a right angle at top; then the breadth of the building with its half added, is the girt over both sides.

In angles formed in a roof, running from the ridge to the eaves, when the angle bends inwards, it is called a valley; but when outwards, it is called a hip.

Deductions are made for chimney shafts or window holes.

EXAMPLES.

1. Required the content of a slated roof, the length being 45 feet 9 inches, and the whole girt 34 feet 3 inches.

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2. To how much amounts the tiling of a house, at 25s. 6d. per square; the length being 43 feet 10 inches, and the breadth on the flat 27 feet 5 inches, also the eaves projecting 16 inches on each side, and the roof of a true pitch? Ans. £24 9s. 5d.

PLASTERERS' WORK.

Plasterers' work is of two kinds, namely, ceiling, which is plastering upon laths; and rendering, which is plastering upon walls which are measured separately.

The contents are estimated either by the foot or yard, or square of 100 feet. Enriched mouldings, &c., are rated by running or lineal measure.

Deductions are to be made for chimneys, doors, windows, &c.

EXAMPLES.

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

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2. To how much amounts the ceiling of a room, at 10d. per yard; the length being 21 feet 8 inches, and the breadth 14 feet 10 inches? Ans. 1 98. 8åd.

3. The length of a room is 18 feet 6 inches, the breadth 12 feet 3 inches, and height 10 feet 6 inches; to how much amounts the ceiling and rendering, the former at 8d. and the latter at 3d. per yard; allowing for the door of 7 feet by 3 feet 8, and a fireplace of 5 feet square? Ans. £1 13s. 3d.

4. Required the quantity of plastering in a room the length being 14 feet 5 inches, breadth 13 feet 2 inches, and height 9 feet 3 inches to the under side of the cornice, which girts 8 inches, and projects 5 inches from the wall on the upper part next the ceiling; deducting only for a door 7 feet by 4.

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PAINTERS' WORK.

Painters' work is computed in square yards. Every part is measured where the colour lies; and the measuring line is forced into all the mouldings and corners.

Windows are done at so much a piece; and it is usual to allow double measure for carved mouldings, &c.

EXAMPLES.

1. How many yards of painting contains the room which is 65 feet 6 inches in compass, and 12 feet 4 inches high?

Ans. 89 yards 6 feet 10'.

2. The length of a room being 20 feet, its breadth 14 feet 6 inches, and height 10 feet 4 inches; how many yards of painting are in it, deducting a fire-place of 4 feet by 4 feet 4 inches, and two windows each 6 feet by 3 feet 2 inches? Ans. 73 yds.

3. What cost the painting of a room at 6d. per yard; its length being 24 feet 6 inches, its breadth 16 feet 3 inches, and height 12 feet 9 inches; also the door is 7 feet by 3 feet 6, and the window shutters to two windows each 7 feet 9 by 3 feet 6, but the breaks of the windows themselves are 8 feet 6 inches high, and 1 foot 3 inches deep: deducting the fire-place of 5 feet by 5 feet 6? Ans. £3 38. 10d.

GLAZIERS' WORK.

Glaziers take their dimensions either in feet, inches, and parts, or feet, tenths and hundredths. And they compute their work in square feet.

In taking the length and breadth of a window, the cross bars between the squares are included. Also windows of round or oval forms are measured as square, measuring them to their greatest length and breadth, on account of the waste in cutting the glass.

EXAMPLES.

1. How many square feet contains the window which is 4.25 feet long, and 2.75 feet broad?

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2. What will the glazing a triangular sky-light come to at 10d. per foot; the base being 12 feet 6 inches, and the perpendicular height 6 feet 9 inches? Ans. £1 158. låd.

3. There is a house with three tier of windows, three windows in each tier, their common breadth 3 feet 11 inches;

now the height of the first tier is 7 feet 10 inches,

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Required the expense of glazing at 14d. per foot.

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Ans. £13 11s. 101d.

4. Required the expense of glazing the windows of a house at 13d. a foot; there being three stories, and three windows in each story: the height of the lower tier is 7 feet 9 inches,

of the middle

of the upper

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and of an oval window over the door 1

The common breadth of all the windows being 3 feet 9 inches.

Ans. £12 5s. 6d.

PAVIORS' WORK.

Paviors' work is done by the square yard, and the content is found by multiplying the length by the breadth.

EXAMPLES.

1. What cost the paving a foot-path at 38. 4d. per yard; the length being 35 feet 4 inches, and breadth 3 feet 3 inches?

Ans. Content 12 yards 6 feet 10'. Cost £2 28. 6d.

2. What will be the expense of paving a rectangular court yard, whose length is 63 feet, and breadth 45 feet; in which there is laid a foot path of 5 feet 3 inches broad, running the whole length, with broad stones, at 3s. a yard; the rest being paved with pebbles at 2s. 6d. a yard? Ans. £40 58. 10d.

PLUMBERS' WORK.

Plumbers' work is rated at so much a pound, or else by the hundred weight of 112 pounds.

Sheet lead used in roofing, guttering, &c., is from 7 to 12tbs. to the square foot. And a pipe of an inch bore is commonly 13 or 14 tbs. to the yard in length.

EXAMPLES.

1. How much weighs the lead which is 39 feet 6 inches long, and 3 feet 3 inches broad, at 8 lbs. to the square foot?

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2. What cost the covering and guttering a roof with lead, at 188. the cwt.; the length of the roof being 43 feet, and breadth or girt over it 32 feet; the guttering 57 feet long, and 2 feet wide the former 9.831 lbs., and the latter 7.373 lbs. to the square foot? Ans. £115 98. 1d.

ARCHED AND VAULTED ROOFS. To find the concave surface of a circular, gothic, or elliptical vaulted roof.

RULE.-Multiply the length of the arch by the length of the vault for the required surface.

NOTE.--The length of the arch, for most practical purposes, is found by applying a small cord along its concavity, and then measuring its length.

EXAMPLE.

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What is the concave surface of Caerfylly bridge, over the Taafe which is a segment of a circle, span 140, height 35, and width 12 feet? Ans. 1944 4 square feet. To find the content of a circular, gothic, or elliptical roof. RULE.-Multiply the area of the end by the length of the roof for the content of the vacuity.

To find the solid content of the materials.

From the solid content of the whole arch take that of the vacuity for the solid content of the materials.

EXAMPLE.

Required the solidity of the vacuity and of the materials of a

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