36 The Magnifying Power of Glqffes * 
See the Table 1 . 
As this Table is given in round Num¬ 
bers, it is fo clear and eafy, that I believe 
whoever can but divide and multiply a few 
Figures will readily underftand it. 
I have taken no Notice of any Magnifier 
whole Focus is at a greater Diftance than 
the half of an Inch ; becaufe Glades that 
magnify lefs than that, may very eafily be 
calculated by the Rules above laid down : . 
nor, when I come to the greateft Magnifiers, 
have I mentioned any of a fhorter Focus 
than the one hundreth Part of an Inch ; 
fince it is fo difficult to grind a Lens to a 
Smalinefs beyond, or even fo minute as this, 
that perhaps few of my Readers may ever 
meet with fuch an one. And though Glo¬ 
bules of Glafs may be melted fo extremely 
little as to have their Focus at not half this 
Diftance, and confequently their magnifying 
Powers prodigioufly greater; theUfe of them 
is fo troublefome, and attended with fuch 
Want of Light, fuch Undiftin&nefs and 
Uncertainty, that, indeed, they are of very 
little Service. 
The magnifying Powers of the Glades em¬ 
ployed in Wilson’s Pocket Microfcope, and 
alfo of thofe belonging to the opake Micro- 
fcope, are to be calculated in the forego¬ 
ing Manner. And as People will, no Doubt, 
