. The Columbian magazine : or, monthly miscellany. d of lightning, which ftruck this part in1779 ; the other head has not thefmalleft vein, and the intrados is fofmooth, that the martins, which flyround it in great numbers, cannotfaften on it. The abutments, whichhave a gentle flope, are entire ; and,without being abfolute planes, haveall the polifh which a current of v/a-ter would give to unhewn ftone in acertain time. The four rocks ad-jacent to the abutments feem to beperfedly homogeneous, and to havea very trifling flope. The two rockson the right bank of th« rivulet aretwo hundred feet hi
. The Columbian magazine : or, monthly miscellany. d of lightning, which ftruck this part in1779 ; the other head has not thefmalleft vein, and the intrados is fofmooth, that the martins, which flyround it in great numbers, cannotfaften on it. The abutments, whichhave a gentle flope, are entire ; and,without being abfolute planes, haveall the polifh which a current of v/a-ter would give to unhewn ftone in acertain time. The four rocks ad-jacent to the abutments feem to beperfedly homogeneous, and to havea very trifling flope. The two rockson the right bank of th« rivulet aretwo hundred feet high above thefurface of the water, the intradr^sof the arch 150, and the two rockson the left bank 180. If we confider this bridgefimply as a pi6lurefque objeft, wgare ftruck with the majefty withwhich it towers in the valley. Thewhite oaks, which ,p;row upon it,feem to rear their lofty fummits tothe clouds ; whilft the fame trees,which border on the rivulet, appearlike fhrubs. As for the naturalift,,he rauft content himfelf with fuchobferrations. OY >4^.r>^ ^^^^^V - ^ 6/ /^ < # # # #,^^^ # # # # I 2 ^^ %^ ^f? -^^^^ ^^ <^^ ^ -y^ ^ THE COLUMBIAN MAGAZINE, For S E P T E M B E R, 1787. A Defcriptmi o/Mf Natural Bridge, called hi Virginia^ RockyBridge, with an elegant Engraving annexed. ** ^ \^ H E natural bridge formsX an arch of fifteen toifes,(fix feet Englifti) in length, ofthat fpecieswe denominate the Cg-vj*tHorn : the chord of this arch is fe-ventecn toifes at the head oi Aniont^and nine at that of Aval^ and theright arch is the fegment of an el-lipfc, fo flat that the fmall axis isonly a twelfth of the large mafs of rock and ftone whichloads this arch is forty nine feet fo-lid on the key of the great centre,and thirty-feven on that of the fmallone ; and as we find about the famedifference in taking the level of thehill, it may be fuppofed that theroof is on a level, the whole lengthof the key. It is proper to obferve,that the live rock continues alfo
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