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Show Chap.XXXI. A Difcourfe of Foreft-Trees. jameter,and three inches i 19 1. Elm of + Inch diameter, with j d horizontally, he broke Leeonbtall swith 47 1. Vertically with 23 1, Ele eas diameter, and it Inch long, broke horizontally with 124, Vertically with 104, which is Note-worthy, Fuly 6. 1664. Woods profecuted + A piece of iment of breaking ok.~ rgpavenes and dine Incheslong, at which diftance weight hung, broke horizontally with 48 /, Vertically with 40h, Af of * Lach diameter, and 3 Inch long, horizontally with 77 /. —_ cally, with 751. Afb of sInch diameter , and 13 [uch long , borézontally with 19/4. Vertically, with 121. @&c. Thus far the Regi- ie 8, Here might comein the Problemes of Cardinal Cufain Lib.4. Idiotae dial. 4! concerning the different velocity of the Ajcent of great piecesof Timber, before the fualler, fubmerged in water 5as alfo of the weight; asv.g. Why piece of Wood rool. “ie ’ poifing more inthe Air than 2 /ofLead,the 2 /.of Lead fhould feem to weigh (he fhould fay Sink) more in the Water ? Why Frasts being cut off from the Tree, weigh heavier, than when they were growing ? with feveral the like Paradoxes, haply more curious a than.#/eful, and therefore we purpofely omit them. 19. Concerning Squar'd, and Principal Timber for any ufua Building, thefe are the legal Proportions, and which Builders ought not to vary from, F. Summers or Gir- ders from ( In. In. ¥. 14 16 18 to 20 In length, 20 intheir muft be 1 Feet 8 ) 23 ey Square. 13 & 9\ Foylts 14 "2 of /16 12 26 28 17 23/ 1rt Inch Inch In length muft be in their ‘S104 Square. (4 Fo F.DInlength( 6 § ee and Beams a Inch 5 Binding Trim- .)7 torr muftbe )7 & 5 of any lengthfrom 15 7 10 & 6 Foyits & ming 2 intheir)8 ¢ foot, may have in 6 their (quare—_ 8 from Square F. 1g tod 18} Purlynes from F. In length, mutt 18 + X have in their ant S fanare F. \in In length length (s(In. 124—142 muft have \y4x _ ygu intheir \9 Fr Principal Rafters cut i Taper from In.ak : erage ; one fide ; 24;— 26} Principal Difebargersc Foot 12 x \fingle F. ~)muft have 5-34 §}97\ sesin Pother Zi Plength og in ‘ their. & (s) ef. 7\ the 18h to ars jon on % to 8 2 9—8 & 12—9 of 8g fide 8{ from )s\ si C7 oi. 63 93 {qe 5-4 > mufthaveCInch Inch of any fength fone 10 in their Cupward S fauare > 16 Chap. XXXI. A Difcourfe of Forett-Trées, and Erecting the Carcafe (as theycall it’) of any Timber Edifice, which is valued according.to the goodnefle and choyce of the Materials, and curiofity in Framing, e{pecially Rooft and Stayre- cafes, which are of moft charges. And dere might alfo fomething be added concerning the manner of framing the Carcafes of Builde ings, as Of Floors, pitch of Roofs, the length of Alps, and Sleepers, together with the mames of all thofe feveral Timbers ufed in Fabrics totally confifting of Wood; but I find it done to my hand, and Publifh'd fome years fince, at the evdof a late Trani. lation of the firft Book of Palladio, to which I refer the Reader. And toaccomplith our Artif in Timber, with the utmoft which that gaterial is capable of; to the Study and Contemplation ‘of that ftupendious Roof’, which now lies over the ever renowned Sheldonean Theater at the Univerfity of Oxford ; being the fole Work and Contrivement of that my moft Honoured Friend Dr, Chr. Wren; now worthily dignified with the Superintendency of his Aajefties Buildings. 20. Wedid, in Chap, 21. mention certain Subterranean Trees A which Mr. Cambdex fuppofes grew altogether under the ground : And truly, itdid appear a very Paradox-to me, tilll both faw,and diligently examin’d that piece ( Plank, Stone, or beth thall Iname it.) of Lignumfoffile taken out of acertain Quarry thereof at Agua Sparta not far from Rome, and fent to the moft incomparably learned Sir George Ent, by that obliging Virtuo/o Cavalier dal Pozzo. He that fhall examine the bardnefe, and feel the ponderoufucfe of it , finking in water, 8c, will eafily take it fora ffone, buthe that fhall behold its graizy fo exquifitely udulated , and varied together with its colour, manner of hewing, chips, and other moft perfect refemblances, will never {cruple to pronounceit arrant wood, Signor Steliuti (an Italian) has publifh'd a whole Treatife exprefly to defcribe this great Curiofty : And there has been brought to our xotice,a certain relation of an Elm growingin Bark-fhire neer Farringdon, which being cut towards the Root, was there plainly Petrified ; the like, asI once my felf rememberto have feen in another Tree, which grew quite through a Kocknear the Sepulchre of Agrippina (the Mother of that Monfter Nero) at the Baia by Naples, which appear’d to be all Stone, and trickling down in drops of Water, if [forget not. But, whiles others have Philofophiz’d according to their manner uponthefe extraordinary Concretions 5 fee what the moft induftrious 5 and knowing Mr. Hook, Curator of this Royal Society, has with nolefle Reafon, but more fuccinétnefle , obferv d from alate Aicrofcopical Examen of another’ piece ofpetrifid wood ; the Defcription, and Ingenuity whereof cannot but gratifie the Curios , who will by this Inftance,not onely beinftructed how to make Inquiries upon the like occafions ; but fee alfo with what accuratenefe the Society conftantly proceeds in all their 12 13 Indagations, and Experiments 3 and with what Candor theyrelate, But Carpenters alfo work by Square, whichis 10 foot in Framing and and communicate them. 21. “Ie refembi'd wood, in that * Firft, |
