f 5°6 ] 
A Table of the Focal Diftances of Mr. Leeuwenhoeks 26 
Microfcopes , calculated by an Inch Scale divided into 100 
Tarts ; with a Computation of their magnifying Towers , 
to an Eye that fees fmall Objects at 8 Inches , which is the 
common Standard. 
Micro- Diftance Power of mag- Power of mag- 
fcopeswith of the nifying theDia- nifying the 
the fame Focus. meter of an Superficies. 
Focus. Objed. < 
Farts of an Inch. 
Times. 
Times. 
I. 
JL or _L_ 
• 2 0 . 1 0 0 
160 . . . 
. 256OO. 
I. 
6 
• ,100 
. 133 nearly. 
. I 7689. 
I. 
_ 7 _ 
* 100 
1 
. 114 nearly. 
. 12996. 
3. 
8 
* 100 * * 
• 1 00. • • • 
. 10000. 
3 - 
9 
* 100 * * 
. 89 almoft. 
. 7921 almofl. 
8. 
' I 
♦ 1 0 * * * 
. 6400. 
2. 
1 1 
* I ©O * * * 
. 7 2 fomething more. 
• 
. 5184 fomething more 
3 • 
12 
* IOO * • * 
. 66 nearly. 
• 43.56 nearly. 
2. 
i 4 
• IOO • * • 
. 57 • • • 
• 3 249* 
. 
I. 
I f 
• IOO • • * 
. 5 3 nearly. 
. 2809 nearly. 
I. 
I 
• T • • • 
• 4^* • • • 
. 1600. 
2 6. 
* This largeft Magnifier of all is in the Box marked 25. 
i J x 
It 
