Elementary Principles of Carpentry: A Treatise on the Pressure and Equilibrium of Timber Framing; the Resistance of Timber; and the Construction of Floors, Roofs, Centres, Bridges, &c. with Practical Rules and Examples. To which is Added an Essay on the Nature and Properties of Timber, Including the Methods of Seasoning, and the Causes and Prevention of Decay, with Descriptions of the Kinds of Wood Used in Building. Also Numerous Tables of the Scantlings of Timber for Different Purposes, the Specific Gravities of Materials, &c

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E.L. Carey and A. Hart, 1837 - 280 էջ

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Էջ iii - THE ELEMENTARY PRINCIPLES OF CARPENTRY : a Treatise on the Pressure and Equilibrium of Timber Framing, the Resistance of Timber, and the Construction of Floors, Arches, Bridges, Roofs, Uniting Iron and Stone with Timber, &c. To which is added an Essay on the Nature and Properties of Timber, &c., with Descriptions of the Kinds of Wood used in Building ; also numerous Tables of the Scantlings of Timber for different purposes, the Specific Gravities of Materials...
Էջ 229 - ... a yellowish or brownish white, with pores inclined to red. Elm is in general porous, and cross-grained, sometimes very coarse grained, and has no larger septa. It has a peculiar odour. It twists and warps much in drying, and shrinks very much both in length and breadth. It is difficult to work, but is not liable to split, and bears the driving of bolts and nails better than any other timber. The timber of the English elm is generally esteemed the best, that of the wych elm is equally as good,...
Էջ 182 - Hesiod to the same effect ; and adds, " as the houses of the ancients were so smoky, it may be easily comprehended how, by means of smoke, they could dry and harden pieces of timber.
Էջ 168 - It was further desirable to ascertain the degree of dependence that might be placed on nailing two pieces together, and Mr. Bevan kindly undertook to make some trials. Two pieces of Christiana deal, seveneighths of an inch thick, were nailed together with two sixpenny nails ; and a longitudinal force in the plane of the joint, and consequently at right angles to the direction of the nails, was applied to cause the joint to slide; it required a force of 712 Ibs., and the time was 15 minutes; the nails...
Էջ 52 - ... the square root of the quotient will be the diameter of the pump plunger in inches (allowing 5 per cent.
Էջ 76 - Two models were made 18 inches ^square ; one consisted of .single joists, the other framed with girders, binding, bridging, and ceiling joists; the single joists of the one contained the same quantity of timber with the girders alone of the other. They were placed in a wooden trunk 18 inches square within, with a strong projection on the inside for the floors to rest on, and small shot was gradually poured over. The single joisted floor broke down with 487 pounds ; the framed floor, with 32 7 pounds.
Էջ 57 - Multiply the number in the table by the breadth and square of the depth in inches, and divide the product by the length in feet : the quotient will be the weight, in pounds.
Էջ 246 - It is extremely durable in all situations, failing only where any other kind would fail ; for this valuable property it has been celebrated from the time of Vitruvius, who regrets that it could not be easily transported to Rome, where such a wood would have been so valuable. It appears, however, that this was sometimes done; for we are told that Tiberius caused the Numachiarian Bridge, constructed by Augustus, and afterwards burnt, to be rebuilt of larch planks procured from Rhaetia.
Էջ 17 - ... parts of the body ; then a plummet hung from the same tack will fall on the centre of gravity. Another method : Lay the body on the edge of a triangular prism, or such like, moving it to and fro till the parts on both sides are in equilibrio, and mark a line upon it close by the edge of the prism : balance it again in another position, and mark the fresh line by the edge of the prism ; the vertical line passing through the intersection of these lines, will likewise pass through the centre of...

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