8i2 Dr. maskelyne’s Account of 
will doubtlefs fuggeft many other ufeful applications of 
this inftrument. 
A paper from the learned Abbe boscovich was read 
before this Society the ninth of lad: June, defcribing a 
fimilar contrivance as an invention of the Abbe rochon, 
in which the Abbe boscovich himfelf alfo claims fome 
fh are ; I therefore defire to acquaint this Society, that I 
communicated this invention to Mr. dollond, and had 
it executed by him ; and alfo fhewed the indrument itfelf, 
fo executed, to my edeemed friend Alexander aubert, 
efq. fellow of this Society, a gentleman very well quali- 
fied to judge of things of this nature, above a twelve- 
month before the communication of the Abbe bosco- 
vich’s paper, as will appear from their written atteda- 
tions, drawn up at my defire, defcribing the particulars 
of the communication of this invention which I made to 
them fo long ago. May I be permitted to remark, that 
this indrument having been executed by my directions, 
in feveral forms, by Mr. dollond, between the months 
of March and Augud, 1776, and fet up and tried at his 
houfe in the prefence of feveral of his workmen, could 
not be confidered as an abfolute fecret concealed from the 
public. However, I doubt not that the following atteda- 
tions of Mr.- aubert and Mr. dollond will fufficiently 
prove my title to this invention of the prifmatic micro- 
6 meter ; 
