(Several differ ent Measures are in use by Artificers.)

3742. Carpentry and Plastering are measured by the square foot or yard; or in moulded or ornamental work, by the lineal font. In extensive works the square of 100 feet is also used. Deductions are made for chim. neys, doors, windows. etc.

3743. Bricklaying is estimated by reducing the work to the standard thickness of a brick and a half thick, and is measured by the running perch - one foot high, and a brick and a half thick. Brickwork is often measured by the square yard (9 square feet.) or by the perch, or square rod of 30 1/4 square yards (2724 square feet.)

2724 = square of 16 1/2 feet 304 = square of 5 1/2 yards. And if the wall is more or less than a brick and a half thick, it may be reduced to that standard by multiplying the number of square rods or yards by the number of half bricks in thickness, and dividing the product by 3.

3744. Masonry is estimated by the square and cubic foot - the materials being measured by their cubic contents, and the execution of the work by the square foot, including in the measurement every projection. Thus walls, columns, blocks of stone, granite, or marble, are measured by the cubic foot: and pavements, slabs, chimney-pieces, etc, by the superficial or square foot. In the solid measure, the true length, breadth, and thickness are taken, and multiplied continually together. In the superficial, there must be taken the length and breadth of every part of the projection, which is seen without the general upright face of the building.

3745. Paving is measured by the square yard, and the true area is taken for the contents.

3746. Painters' Work is com puted in square yards. Every part is measured where the color lies, and the measuring tape is forced into all the mouldings and corners. It is usual in allow double measure for carved mouldings, etc.

3747. Glaziers take their dimensions either in feet, inches, and parts, or 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, round or oval windows are considered rectangles, and measured to their greatest length and breadth, on account of the waste in cutting the glass.

3748. Slating and Shingling are estimated by the square of 100 sqr. feet.

The average size of slates are as follows;

The contents of a roof is found by multiplying the length of the ridge by the girt over from eaves to eaves - allowing in the girt for the double row of elates or shingles at the bottom, or for how much one row is laid over another. Deductions are made for chimney shafts or window holes, If sky-lights are not large no allowance is made for them.

3749. Plumbers' Work is calculated at so much a pound, or by the hundred-weight of 112 lbs. Sheet lead, for roofing, guttering, chimneys, etc, is from 6 to 10 lbs. to the square foot, depending on its thickness. Lead pipe, 1 inch in the bore, is about 14 lbs., to the linear yard.