LEEUWENHOEK’S MICROSCOPES 319 
‘‘was sensible it must cost much Trouble.” ‘‘ This Task,”’ 
he says, ‘“I have performed, with as much care and Exact- 
ness as I was able.” His results were summarized in a table, 
which I here reproduce in full: * 
A Table of the Focal Distances of Mr. Leeuwenhoek’s 26 
Microscopes, calculated by an Inch Scale divided into 100 
Parts; with a Computation of their magnifying Powers, 
to an Hye that sees small Objects at 8 Inches, which is the 
common Standard. 
Micro- Distance Power of mag- Power of mag- 1 
scopes with of the nifying the Dia- nifying the ie 
the same Focus. meter of an Superficies. oN 
Focus. Object. 
Parts of an Inch Times Times 
ale so O goo ee ee AGOW: 5: 5,c on ke eae sO OOO > 
1: Fae eRe OR 133; nearly <9 )-ucva oso. 
1, TG) ene Meee 114) nearly:« <¢icccuansn ete 12996: 
3. FAG ORES tien LOO 3s, sas Yay edo 10000. 
3. Bera ht gessoi ag ck nal atlas 89! almost... cco useemes 7921 almost. 
8. Sep wee eu eaayts er. SO. sat «cise nee 6400. 
2. iro eC ee 72 something more... 5184 something more. 
3. eh oes She = 66 nearly’... 5". «eas 4356 nearly. 
2. Sea ota satet aie Diy! a Lay gsy chee eee 3249, 
al Se (AE aoa ee ae BS mearly, i.) cucseasas ss 2809 nearly. 
1. at Pee See a 40: ' 2S 2 ca eee 1600. 
26 
* This largest Magnifier of allis in the Box marked 25. [Note by Baker. | 
Baker himself notes regarding these figures: “ I have given 
the Calculations in round Numbers, the Fractions making but 
an inconsiderable Difference; and I hope any Mistakes I may 
have made in so nice a Matter will be excused”. I must also 
note—since it has been generally overlooked—that all the 
magnifications are given for an image-distance (8 inches) 
which is not the “common standard” now universally adopted 
(10 inches). Consequently, all Baker’s “magnifying powers”’ 
represent only ~ of the actual magnification according to 
modern notation: and therefore the “largest Magnifier”, with 
nn 
1 Baker (1740), p.506. The later description (Baker, 1753; p. 436), 
though that usually quoted, gives far less detail. 
