40 THE PROPERTIES AND QUALITIES 



perspective : for that yt maketh a large beame, 

 whereby that a small thinge may be scene, at 

 a greate distance from you: and especially to 

 bee amplified by the ayde of other glasses, &c. 



CHAPTER V. 



In what order to make a glass, that yow may 

 looke thorow, that shall forther your sighte, and 

 to have a small thynge to seem bigg, which ys 

 very necessary for perspective: And yt may 

 bee so made, that you may discerne a small 

 thinge, a greate distance, and specyally by the 

 ayde of other glasses. 



And nowe furdermore, as I have shewed before, 

 the forme, and facyon of glasses, that dothe 

 reflect a beame from the glasse, commonly called 

 Lookinge Glasses : So in lyke manner I will 

 shewe you the makinge of Glasses called perspec- 

 tive glasses, that do helpe sighte, by the meanes 

 of the beame, that pearceth commonly thorowe the 

 glasse. And first for makinge of the smallest 

 sorte of them, commonly called spectacle glasses. 

 These sortes of glasses ys grounde vppon a toole 

 of Iron, made of purpose, somewhat hollowe, or 

 concave inwardes. And may be made of any 

 kynde of glasse, but the clearer the better. And 

 so the Glasse, after that yt ys full rounde, ys 

 made fast with syman vppon a smalle block, 



