426 Remarks on a Micrometer , &c c 
1 
Society , and firft Prefident, under the Royal 
Charter, of the Society of Antiquaries of 
London 
Remarks on a Micrometer to he applied i$ 
Double compound Microfcppes. By Mar¬ 
tin Fqlkes, Efq* P. R. S. 
T HIS Micrometer only confifls of a 
Lattice of fine Silver Wire difhnt 
from each other one fiftieth Part of an Inch, 
interfering at right Angles, and fo placed 
in the Focus of the Eye Glafs, as to divide 
the whole vifible Area of the Microfcope in¬ 
to Squares, whofe Sides are each the Wth of 
an Inch. 
Now as the Image of any Objedt to be ex* 
amined is formed in this Place, it is plain that 
by this Lattice Work fuch Image may readi¬ 
ly be meafured, either by comparing its 
Length or Breadth with the Diftance of 
* This Gentleman, whofe amiable Chara&erfor Ability in 
Science and- Goodnefs of Heart is known and refpe£ied by 
all the World, being unhappily difabled by a paralytic Difr 
order fiom attending the Meetings of the Royal Society, where 
for eleven Years he bad presided with great Honour, thought 
proper on the Jaft annual Day of Election, vis. November 
joth 1752, to decline being again elected Prefident. Where¬ 
fore the Gentlemen of the faid Society, after returning their 
mod grateful Acknowledgments to Mr. Folkes for his many 
and rueful Services, elefted unanimoufly the Right Honour¬ 
able the Earl of MaceusfieU to be their President in his 
Stead. 
the 
