Alberti, Leone Battista
,
Architecture
,
1755
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56
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Beams ought alſo to be related to one another;
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that is, they ſhould be of the ſame Kind of
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Timber, and raiſed in the ſame Wood, ex
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poſed if poſſible to the ſame Winds, and fell'd
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the ſame Day; that being endued with the
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ſame natural Strength, they may bear their
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Shares equally in the Service. </
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<
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>Let the Beds for
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the Beams be exactly level, and perfectly firm
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and ſtrong; and in laying them take care
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that the Timber does not touch any Lime,
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and let it have clear and open Vents all about
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it, that it may not be tainted by the Contact
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of any other Materials, nor decay by being
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too cloſe ſhut up. </
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<
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>For a Bed for the Beams,
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ſpread under them either Fern, a very dry
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Kind of Herb, or Aſhes, or rather Lees of
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Oil with the bruiſed Olives. </
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<
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>But if your Tim
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ber is ſo ſhort, that you cannot make a Beam
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of one Piece, you muſt join two or more to
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gether, in ſuch a Manner as to give them the
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Strength of an Arch; that is to ſay, ſo that
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the upper Line of the compacted Beam, can
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not poſſibly by any Preſſure become ſhorter;
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and on the contrary, that the lower Line can
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not grow longer: And there muſt be a Sort
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of Cord to bind the two Beams together,
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which ſhove one another with their Heads,
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with a ſtrong Ligature. </
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>The Rafters, and all
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the reſt of the Wood-work, depend upon the
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Goodneſs and Soundneſs of the Beams; being
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nothing elſe but Beams ſplit. </
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>Boards or Planks
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are thought to be inconvenient if too thick, be
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cauſe whenever they begin to warp they throw
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out the Nails; and thin Boards, eſpecially in
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Coverings expoſed to the Air, they ſay, muſt
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be faſtened with Nails in Pairs, ſo as to ſe
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cure the Corners, the Sides and the Middle.
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</
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<
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>They tell us, that ſuch Nails as are to bear any
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tranſverſe Weight, muſt be made thick; but as
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for others, it matters not if they are thinner;
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but then they muſt be longer, and have
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broader Heads.</
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*</
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<
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>BRASS Nails are moſt durable in the Air, or
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in wet; but I have found the Iron ones to be
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ſtronger under Cover. </
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<
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>For fattening of the
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Rafters together, wooden Pins are much uſed.
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</
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<
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>Whatever we have here ſaid of Coverings of
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Wood, muſt be obſerved alſo with relation to
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thoſe of Stone; for ſuch Stones as have Veins,
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or Faults running croſſways, muſt be rejected
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for the making of Beams, and uſed in Columns;
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or if there are any ſmall inconſiderable Faults,
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the Side of the Stone in which it appears,
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when it is uſed, muſt be laid downwards,
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Veins running longways in Beams of any Sort,
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are more excuſable than tranſverſe ones.
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<
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>Tables, or Scantlings of Stones alſo, as well
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for other Reaſons, as upon Account of their
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Weight, muſt not be made too thick. </
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<
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>Laſtly,
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the Beams, Rafters, and Planks that are uſed
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in Coverings, whether of Wood, or Stone,
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muſt be neither ſo thin, nor ſo few as not to
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be ſufficient for upholding themſelves, and their
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Burthens; nor ſo thick, or ſo crouded as to
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take from the Beauty, and Symmetry of the
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Work; but thoſe are things we ſhall ſpeak of
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elſewhere. </
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<
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>And thus much for Coverings of
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ſtraight Lines; unleſs it may be proper to men
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tion one Thing which is in my Opinion tobe neg
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lected in no Sort of Structure. </
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<
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>The Philoſophers
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have obſerved, that Nature in forming the Bo
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dies of Animals, always takes care to finiſh her
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Work in ſuch a Manner, that the Bones ſhould
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all communicate, and never be ſeperate one
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from the other: So we alſo ſhould connect the
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Ribs togther, and faſten them together well
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with Nerves and Ligatures; ſo that the Com
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munication among the Ribs ſhould be ſo con
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tinued, that if all the reſt of the Structure
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failed, the Frame of the Work ſhould yet
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ſtand firm and ſtrong with all its Parts and
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Members.</
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<
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>CHAP. XIII.</
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Of Coverings, or Roofs of Curve Lines; of Arches, their Difference and Con
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ſtruction, and how to ſet the Stones in an Arch.
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<
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>We come now to ſpeak of Roofs made
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of Curve Lines, and we are firſt to
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conſider thoſe Particulars wherein they exactly
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agree with Coverings of ſtrait Lines. </
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<
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>A curvili
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near Roof is compoſed of Arches; and we have
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already ſaid that an Arch is nothing but a
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Beam bent. </
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<
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>We might alſo here mention the
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Ligatures, and thoſe Things which muſt be
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uſed for filling up the Vacuities; but I would
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be underſtood more clearly, by explaining
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what I take to be the Nature of an Arch, and
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of what Parts it conſiſts.</
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<
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>I SUPPOSE then, that Men learnt at firſt to turn
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Arches from this: They ſaw that two Beams
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