The following example will sufficiently explain the appli cation of the foregoing rules in the measurement of the front wall of a house.
Eramplc.—Suppose the front wall of a house to be four stories high, and the length '26 feet ; the fboting to consist of pi:tee-bricks in four courses, which are respectively, 5, 41, 4, and :1!, bricks in breadth ; the basement part of the wall to be built with gray-stocks, 11 feet in height, and 3 bricks in thickness ; the parlour part of the wall to be 11 feet in height, and 21 bricks in thickness ; the one-pair-of-stairs, or principal floor, to be 13 feet in height and 2 bricks in thickness ; the chamber floor to be 10 feet in height and 11- brick in thick ness; the three upper stories to be of gray-stock work, faced with marls; in each of the basement and entrance stories are to he two windows and a door, and three windows in each of the upper stories : the whole of the windows, as well as the doors, to be 4 feet in width ; the windows in the basement to be G feet in height. and not recessed in the inside below the sash-frame; those in the parlour-story to be 81 feet in height, recessed from the inside of the room below the sash-frame, which is to be placed two feet above the surface of the floor ; those in the drawing-room story to descend to the bottom, and to be in height 10 feet. The upper windows to be 11 feet 9 inches in height, and 2/ feet above the surface of the floor, the head of the basement door to be upon a level with the windows, and the jambs S feet high. The street-door to entrance, or parlour-story, to be semicircular, and the top of the arch upon it level with the soffits of the heads of the windows; the sash-frames to be all sunk within the jambs in 4 inch reveals ; likewise the under sides of the wooden lintels above the level of the soffits of the brick heads, to be recessed 3 inches upward, and the door-frames 13 inches into the jambs, and also 3 inches into the head ; all the windows and doors to have rubbed and ganged arches : the arches of the windows to be 11 inches broad, and in height equal to flinr courses of the wall. Their mean length, or horizontal dimension, to be 41--, feet ; the soffits to be the breadth of a brick, or •11 inches, and the length is consequently four feet, the breadth of the windows : the arch of the door to lie 9 inches broad on the face, and as much on the soffit : how much will the whole amount to, supposing the rod of place bricks to be .1:1• 15s., the rod of gray-stock work to be £14 10s., the extra facing of best marl stocks to be sixpence per foot superficial, the extra price of the rubbed and gauged arches per foot, and the lineal foot of angles in apertures to be a penny per foot : likewise, what will be the price of a rod, supposing the apertures not deducted, and what will be the rate if they are deducted, without making any other extra charge whatever; so that the profit of the master bricklayer shall be the same in either case? The dimensions are generally taken with two five-feet rods, and entered in a book, ruled perpendicularly for the purpose.
In brickwork it will be convenient to have three columns contiguous to each other on the left hand ; the first vertical column to contain the dimensions, and to be only bounded by one vertical line on the right-hand side of the column : the dimensions of the same surface to be written one under the other, putting the like denominations in vertical rows ; the number of times any work is repeated is put on the left of the upper dimension, and separated from it by a curve ; the number of half bricks are to be written in the adjoin ing right-hand column, ruled on both sides, and in a horizontal line with either dimension.
It would answer little purpose to show the work arising by squaring the dimensions. it may be proper to observe, in order to avoid numerous repetitions of division, that the dimensions of the surfaces, in length and breadth, must be multiplied together, and the product multiplied by the num ber of times, if more than once repeated, and this last pro duct again by the number of half bricks in the thickness of the work : but if the outline of the surface of the work be circular, or any figure whatever, the quantity of surface must be found by the rules for measuring that figure, and repeated the number of times, and this product by the number of half bricks in the thickness of the work, as betiire. These products may be found by beginning with any of the multipliers. and using any one of the remaining ones in each sueceeding product until their number is exhausted ; the result is to be placed in a third adjoining column on the right, in a horizontal row with either of the dimensions. The dimen sions, the number of half bricks, and contents of every two surf:i•es, arc to he separated from each other by a hori zontal line. The numbers in the third column are the con tents of the work reduced to a wall, half a brick thick : and consequently, any number of contents of the same species of work may be added together, and reduced to the standard by dividing the sums by 3 ; and if rods are required, the quotient must be divided by 272, which will save immense labour.