Some observations made in travelling through France, Italy, &cin the years MDCCXX, MDCCXXI, and MDCCXXII . ve been once of a considerable height) without Hoop-ing very low ; almoft indeed creeping on all four. Water laywithin it when we faw it. The ftory above, which is imme-diately coverd by this extraordinary roof, is now usd as achapel. I meafurd the diameter of the floor, (which wasthe fame as meafuring the roof,) and found it about 30 feet;it lay, as they told us, four feet more each way on the wall,which brings it to about 38 feet diameter. As to the thicknefsof it, Mr. Addifons and MiiT
Some observations made in travelling through France, Italy, &cin the years MDCCXX, MDCCXXI, and MDCCXXII . ve been once of a considerable height) without Hoop-ing very low ; almoft indeed creeping on all four. Water laywithin it when we faw it. The ftory above, which is imme-diately coverd by this extraordinary roof, is now usd as achapel. I meafurd the diameter of the floor, (which wasthe fame as meafuring the roof,) and found it about 30 feet;it lay, as they told us, four feet more each way on the wall,which brings it to about 38 feet diameter. As to the thicknefsof it, Mr. Addifons and MiiTons account may both be true,though one fays tis 15 feet thick, and the other only 4 : forthe original thicknefs of this vaft ftone, taken from the topto the level of the bafis at the edges, may be 1 5 feet; but itis now hollowed within, and cut to a fuitable convexity with-out j fo as to be reduced to a fhell of four feet thick. It appears of a furprifing bulk ; efpecially as you ftand on The draughtthe top of it, on the outlide. a the bottom* x gives fome reprefenta-tionof it, thonot drawn in) Together. n° RAVENNA. Together with its hiftory, and the account of its dimenfionsthey fliew thefe lines: S ella e una pietra folaDimmi tu con qual arte o ordegno Jlrano,Qua fu Iha collocata ingegno humano :O, fe fono piu pietre unite injieme,Moflra duna di lor le parte ejireme. If what thou feeft be but one fingle ftone, Tell me by what device, what ftretch of art, By what machine, at fuch a height twas placd ; If more than one, fay where their edges meet. I remember a Latin diftich, (I think tis infcribd under oneof the obelifks in Rome) of which the lines above feern to bea translation. Si lapis ejl unus, die qudfuit arte levatus ;Vel,Jifunt plures, die ubi contigui. If its one ftone what engine coud they find To raife it up ? if more, ihew where theyre joind. On the top of the convex outride flood the porphyry-tombof Tbeodoricj but it was beaten down, as fome write, by acann
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