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XVII. Obfervation of the Eclipfe of the 
Sun, the \Jl of April 1764, made in Sm- 
ry-ftreet, in the Strand, London: By 
James Short, M. A, i F. R . fi. 
Read April 5, H E morning of the eclipfe I had 
X provided the inftruments I judged 
would be neceffary for obferving it in fuch a manner 
as to be fatisfadory to the Royal Society as well as 
to myfelf. A receding telefcope of two feet focal 
length, it’s aperture four inches and a half, and it’s 
magnifying power feventy times. To this telefcope 
was fitted a micrometer with an achromic objed-glafs 
of 40 feet focal length. 
The right honourable the Earl of Morton, now 
Prefident of this Society, was pleafed to honour me 
with his company, and alfo to obferve ; but in different 
rooms, out of fight and hearing of one another. His 
Lordfhip ufed a refledor of only eighteen inches focal 
length, four inches and a half aperture, and a power 
of forty times, to the eye-piece of which a helio- 
fcope was adapted, for viewing the Sun difiindly, 
without the leaf! inconvenience to the eye. 
The condition of the air was very unpromifing, 
for, befides a general hazinefs of the Iky, thin flow 
moving clouds were frequently palling over the Sun 
from 
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