Practical carpentry, joinery, and cabinet-making [by P. Nicholson

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Page 40 - ... corresponds to the intended concavity of an arch. When the piers or abutments are carried up to the height designed for the springing of the arch, the next object is to set up the centre, the proper construction and erection of which may well be considered as the most masterly operation in erecting arches. In constructing the centre for an arch, the principal object to be kept in view is, to fix the beams in such a manner as to support, without change of shape, the weight of the stones and other...
Page 124 - Furrings, slips of timber nailed to joists or rafters, in order to bring them to a level, and to range them into a straight surface, when the timbers are sagged, either by casting, or by a set which they have obtained by their weight in the course of time...
Page 60 - The strength of beams of the same kind, and fixed in the same manner, in resisting a transverse force which tends to break them, is simply as their breadth, as the square of their depth, and inversely as their length. Thus if a beam be twice as broad as another, it will also be twice as strong, but if it be twice as deep, it will be four times as strong ; for the increase of depth not only doubles the number of the resisting particles, but also gives each of them a double power, by increasing the...
Page 125 - OR SILL. — The lowest plate of a wooden building for supporting the principal and other posts. GROUNDS.
Page 47 - From 1 to 2 From 2 to 3 From 3 to 4 From 4 to 5 From 5 to 6...
Page 123 - Casting or Warping, in joinery, is the bending of the surfaces of a piece of wood from their original position, either by the weight of the wood or by an unequal exposure to the weather, or by the unequal texture of the wood Cast-iron framing, for mill-work, possesses great superiority over that of timber, for constructing the framing.
Page 54 - It is well known that wood contracts less in proportion, in diameter than it does in circumference ; hence a whole tree always splits in drying. Mr. Knight has shown that, in consequence of this irregular contraction, a board may be cut from a tree, that can scarcely be made, by any means, to retain the same form and position when subjected to various degrees of heat and moisture. From the ash and the beech he cut some thin boards, in different directions relatively to their transverse septa, so...
Page 122 - ... when a brace is used by way of support to a rafter, it is called a strut : braces in partitions and span roofs are always, or should be, disposed in pairs, and placed in opposite directions Brace...
Page 122 - BEARING, the distance that a beam or rafter is suspended in the clear: thus if a piece] of timber rests upon two opposite walls, the span of the void is called the bearing, and not the whole length of the timber.
Page 123 - ... piece, thus fixed, traverse those of the board, and by this means prevent it from casting: the piece at the end is called a clamp, and the board is said to be clamped.

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