Of OXFO %T>^S HI %E. lyi 



145. By what means this was effected ; we are not informed by 

 the afore-cited Author, but the Learned Tboma6 Allen M. A. of 

 Glocefler-hall, thought it might be done by a fort of Looking-glafs, 

 whofe ftru&ure he found mentioned in an ancient MS, De Arcarivs 

 & Secretin, with this Title, Speculum in quo uno vifu apparebunt 

 multdt imagines moventesfe. To be made thus, accipefixidembene 

 profundam, & pone infundo ejus frtculum commune, fc. convexum, po- 

 ftea> isre. Take, fays the Author, a deep box, and place in the bot- 

 tom of it a common ccnvexglafi, then take 6 or 7 other convex 

 glajfeso? the fame bignefs, and fcrape off the lead \_plumbum is 

 the word] in the concave part with a knife ; where by the way the 

 Author advifes, that finceit is very hard to get the lead clean off 

 without breaking thcglafs, that Quick-fiver be made ufeof, to a- 

 noint the lead to get it off. 



146. Thcfe glajfes when made clean, he orders to be put into 

 the box, fo as they may ftand obliquely in divers pofitions, in this 

 manner : When the firft glafs is put in the bottom, the fecond 

 muft be fo put, that one fide of it muft touch the firft glafs, and 

 the oppofite fide be diftant from it an inch, & fie (fays he) oblique 

 pones in pixide. In the top there muft be put one cleanfed glafs as 

 the firft, plain and not obliquely, fo that nothing muft be feen but 

 the uppermoftg/d/}, into which if you look, you (hall fee as many 

 Images as glaffe s ; and if turned round, how one Image always 

 ftandsftillin the middle, and the reft run round it, as if they 

 went about to dance. Of which contrivance, though I underftand 

 not fome particulars, yet I thought fit to mention them, becaufe 

 they may poffibly meet with a Reader that may, and tranflate them 

 too as well as I could, for the benefit of them all. As for thofe 

 that have opportunity, and are defirous of feeing the Latin Copy, 

 they may find it in a Mifcellaneom MS. in Mr. Seldens Library 3 . For 

 my part, all that I can add concerning it, is, that I have feen a 

 fort of Cabinets of this nature, that by the help of glajfes placed 

 obliquely havefhewn fuch prety profpecls. 



147. The great bivalve wooden windows in the upper Gallery of 

 the Theater, are fo ingenioufly contrived, that notwithstanding 

 their great weight, yet can never fink fo as to be brought out of 

 fquare, as 'tis ufual in fuch windows, for the Iron bars crofting them 

 from fide to fide, not being fet at right angles, but diagonallyhke 



* 4 MS. 79. in Biblioth. Selden. 



flruts 



