1640 OCt. 9 
10 
27 
2 9 
3° 
3i 
[ 192 3 
16 36 h. 8 p. fih 
16 36 
1 s 38 h 7 p, nu 
1 5 4 l 
15 43 
if 49 
Thefe may fuffice to prove, that Mr. Gafcoigne’s 
micrometer was not a mere thing in embryo, but 
brought to a good degree of perfection above 40 years 
before that of the French gentlemen was ever fo much 
as mention’d. I am, 
S I R, 
Red-lion ftreet, Clerkenweli, Your very humble fervant. 
May 10, 1753. 
J. Bevis. 
XXX. Obfervations of the I’ranfit of Mercury 
over the Sun, May 6, 1753 ; by Mr. J. 
Short, F. R. S. 
Read May 17, A g VHE inftrument prepared for thefe 
X. obfervations was a reflecting tele- 
fcope, of two feet focal length, of the Gregorian 
form, magnifying about 6y times, and fo conftruCted 
in its machinery as to move in a plane parallel to the 
horizon, and alfo, when required, to move in a plane 
parallel to the equator. This telefcope had two eye- 
pieces, each a combination of two glares, viz. one 
eye-piece for the horizontal motion, with wires at 
right angles to one another, the wires being between 
the 
