Remarks on a Micrometer, See, 4 2 9 
fiers, and whofe Image is again viewed with 
one of the greater: for as the Number of 
Millefimals of an Inch contained in its true 
Length or Breadth, are to thofe now found 
in the Length or Breadth of its Image, fo 
will Unity be to the magnifying Power of 
the Objedt Glafs now made ufe of, &c, 
I fhould now farther take Notice, that 
the Numbers here called the magnifying 
Powers of the feveral Objedt Glades, do not 
exprefs the whole magnifying Power of the 
Microfcope. For the Image formed in the 
Focus of the Eye Glafs is again magnified 
to the Eye, by the Operation of the Eye Glafs 
itfelf. And the Focus of this Eye Glafs be¬ 
ing, in the Double compound Microfcope 
made by Mr. Cuff] and which he calls (tho* 
fomewhatimproperly) his new double rejieki^ 
mg Microfcope, at the Diftance of one Inch 
and a Quarter nearly; the Eye, placed on the 
other Side, views the Image of any Objedt 
formed in that Focus under an Angle about 
feven Times as great as that under which it 
would fee it with Difiinctnefs if naked, and 
at the Difiance of fomewhat lefs than nine 
Inches. We may therefore then confider all 
Images viewed with this Microfcope as mag¬ 
nified feven Times in Length or Breadth, or 
4Q Times in Superficies by the Intervention 
of the Eye Glafs: and we may confequently 
exprefs the whole magnifying Powers of the 
Microfcope, if we refpedtively multiply the 
Numbers 
