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Show A Difcourfe of Foreft-Trees. Chap.XX XI. beam, Poplar, &c. Then for Bucklers, and Targets, were commen dedthe more foft and moift; becaufe apt to clofe,fwell, and make up their wounds again ; fuch as Willow, Lime, Birch, Alder, Elder, Afh, Poplar, Gc. s The Robur, or Wild-Oak, Timber, beft to ftand in ground; the Quercus without : The Cppreffe, Fir, Pines, Cedar, rc. for Pofis , and Columns, becaufe of their erec# growth, natural and comely diminutions. Then againit is noted,that Oriental Trees are hardeft towards the Cortex or Bark; our Wefterx towards the middle , which we call the Heart ; and that Trees which bear fruit, or but little, are more durable than the more pregnant. It is noted, of Oak, that the Avots of aninveterate Tree, juft where a lufty arme joynsto the Stem, isas curioully vein'd as the Wall-nut, which o- Chap.XXXI. A Difcourfe of Forelt-Trées, Again,there wasa piece of Firt Inch and twofoot ‘nevi a 33 is piece of + Inch oie4 broadsand long, 9 fans 26> Oroken with 100 weight edge-wife « i Li as foot long, bro ken ar ects Pato ia co a oe price was order' e d tobe repeated by the Prefident a = “bedi etty, and Mr. Hook ; and it was fuggefted by fome f pany, that in thefe tryals conf ideration might b I dof age, knottine(fe, Solidity, feve ral Soyls, and parts of t ahe 1 : Sr. Robert Morray did part ad Te icularly how far aay kind of Wood bexds add, that it cio tne before it breaks March m= 64. mitted in the Chapter of the Oake, I here obferve. Pines, Pitch, Alder, and Elm, are excellentto make Pumps and Conduit-pipes, and for all Water-works, &c, Fir for Beams, Bolts, Bars; being tough, and not fo apt to break as the hardeft Oak : In fam, the more odoriferows Trees are the more durable and lafting. oe Here farther for the #fes of timber, Iwill obferve to our Reader {ome other Particulars for direction both of the Se/er and Buyer , applicable tothe feveral Species : Andfirft of the two forts of Lathes allow’d byStatute, ove of five, the other of four foot long, becaufe of the different Intervalsof Rafters : That offive has 100 tothe Bundle , thofe of four 1205 and to be in breadth tInchand 4, andhalf Inch thick ; of either.of which forts there are three, viz. Heart-oak, Sap-Lathes, and Deal Lathes, which alfo differ in Price : The Heart-oak are fitteft to lye under tyling, the fecond{ort, for plafiring of fide-walls , and the third for Ceilings, becaufe theyare {treight and even. 17. Here we will gratifie our curious Reader with as curious an Account of the Comparative firength and fortitude of the feveral ufual forts of timber , as upon Suggeftions previous to this Work it was feveral times Experimented by the Royal Society, though omitted in the firft Ivpreffion , becaufe the tryals were not complete as they nowthusftand in ourRegifter, March 23. 1663. The Experiment of breaking feveral forts of Wood was begun tobe made : And there were taken three pieces of feveral kinds; of Fir, Oak, and 4/h, each an Inch thick, and two foot long , the Fir weighed 8 3, Ounces, and was broken with 2e0 /, weight : TheOakweigh’d12 4.3, broken with 250 weight - the 4# weighd 10} 3, broken with 325 weight. Befides there were taken 3 pieces of the fame forts of mood each of tinchthick,and 1 foot long: the Fir weigh’d j3, and was broken with {of anico : The Oak weigh’d 1é 3 broken with § of an 100: the 4/h weigh'd 14 5 broken with 1oo/. Again, which the Hypothefis feems to be confirm'd, that in fimila r7505 by the Proportion of the breaking-m ig -weig eightht isj acco rding tothe pieces , bafis of the ee * Secondly, of a piece of Fir 2 foot lon quare, cut away from the midd i le both wayes to half ons which fupported 250 /. weight befor : whichi moenee 50/. than piece of the fame thj eit broke, NAW Mas Gene broken with 5 the difference was na this other piece, 1s Lordjbip was defired to cont ribute toth waa nd particularly, i i to confider what tariae oa and how thick, it ante ought tobe at the Extream, to be y Mtong = Which was brought Ie in April 13, but Ifind it ae ter'd, April 20, 1664; The Experiment of breaking VV0 0d were taken twopieces of Fireach tro w 4s profecuted , and there fo ot long, 'and Inchfq mn wie broken, the one long uare, -wayes With 300 /, weight ,the other ranfverfe-wayes with 2% hundred+ i wood, each of4 of an Inch fqua re, tl meee De ae one long wayes with 15 hundreds the other tafe ak ee a : Thirdly, one piece of 2 ‘gwayes with 81. Fourthly foot long + Inch Guile. brok : , one piece cut out of l Oken-billet , withnaan archi a ng Craii n, long, broken with? hundred, ge ies ee eae June 29. “y 664. Therewere made feveral Experiments mor e of breaking ae a piece of Fir > Inc wood: h diameter, and 3 Inches long epuit ne hung, bro , ke in the Plane of the Graixat which horizone nee ~ S re isl . Troy; Vertically, with 21m ore. Alfo 4 lach diameter, and 14 yi long, broke vertically with 20/ B 2 + and |