Remarks on a Micrometer , &c. 431 
in the Focus of the Eye Glafs, whofe Dis¬ 
tance being 11 Inch, or T Vths of nine Inches, 
(the Standard of Sight he computes by *) 
the Diameter of an Objedl feen through that 
Glafs is magnified 7 Times, and the Side of 
each Square whofe real Length is 4 o, appears 
(magnified through the faid Glafs) to be 
^ths of an Inch. 
Employing different Qbjeft Glafies or 
Magnifiers in viewing Objedfs, makes no Dif¬ 
ference in the Lattice or Micrometer, whofe 
Squares are magnified by the Eye Glafs only, 
and always appear of the fame Diameter, 
that is, t-o ths of an Inch. But the Object 
being more or lefs magnified according to 
the Power of the Object Glafs, the Image 
thereof thrown upon the Lattice extends over 
more or fewer of its Squares : whence the 
magnifying Power of all the Glafies belong¬ 
ing to my Microfcope, and the real Size of 
Objects examined by them, are fhewn in 
the following Table. 
* The ufual Standard of Sight is 8 Inches, but as Mr. 
Folkes has thought proper to make it almoft 9 Inches, all thefe 
Calculations are conformable thereto. 
\ « 
A TABLE 
