43^ Directions for taking off 
jedts only, could be applied to nothing elfe. 
This Method induced him to make a Mi- 
crofcope with a Glafs adapted to almoft eve¬ 
ry Objedt, hill he had got fome Hundreds of 
them, as he fays himfelf, in the 2d Vol. of his 
Works, page 290, Mihi quidem funt centum 
centumque Microfcopia, &c. All this Trouble 
and Expence is now faved, by a Set of Glaf- 
fes to be fhifted with great Eafe, as the Sub- 
jedt to be examined may require. 
The magnifying Powers of thefe Glaffes 
come fhort of fome now made, but are fully 
fufhcient for moil Purpofes. Of the 26 
Microfcopes 1 examined, one magnifies the 
Diameter of an Objedt 160, one 133, one 
114, three 100, three 89, eight 80, two 72* 
. three 66, two 57, one 53, and one 40 
Times. 
Directions for obtaining an exact Peprefenta - 
lion or Picture of any Coin or Medal. 
I YAVING taken a perfedt and (harp 
j[ iinpreffion of the Coin or Medal 
in the fined: Sealing Wax, cut the Wax 
away round the Edges of the Impreilion, 
with the Point of a Penknife, or a Pair of 
lharp Sciffars. 
The Roliing-Prefs Printers have an Ink for 
printing oft Copper Plates, very different 
from what other Printers employ in print¬ 
ing Books: work fome of this with an Hair- 
Pencil 
