OF GLASSES FOR OPTICAL PURPOSES. 37 



your face, or any thinge, that standeth directly 

 right against yt. But yf that you do stande any 

 thinge oblique, or awrye, so shall you receave 

 the beame, or see any thinge that maketh the 

 lyke triangle, eyther acute, or sharpp, and obtuse 

 or broade ; Accordinge vnto the angle : that 

 commeth from youre eye, vnto the glasse. So 

 shall you receave, or see that beame, accordinge 

 vnto the angle on the other syde, whatsoever that 

 yt bee, howe farr soever that thinge ys in distance 

 from the place, or neare hande. 



CHAPTER III. 



In what forme to make glasses for to have them 

 shewe the forme or facyon of any thinge Jess in 

 bignes then yt ys. 



To have a glasse to make any thinge 

 shewe smaller then yt ys, That must be in 

 the makinge thereof made hillye or bossy out- 

 wardes, and to have the foylle layde on the 

 hollowe or concave syde, and so yt may bee 

 made, that youre face showe in the beame 

 that commeth to the eye, as small as you 

 lyst, or any syse that ys less than your face 

 at your pleasure. And for to have yt shewe 

 very smalle, then let yt be made half a globe, or 

 boawle, as smalle as a Tennys balle, and so the 

 foylle layde on the concave or hollowe syde. So 



