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XX. Obfervations on the Eclip/e of the Sun, 
April i, 1764, at Brompton-Park : By 
Mr . Samuel Dunn. 
Read April 5, T)ART of the inftruments which I 
i ; 64. was pj-Qyjjjgjj w i t h f or obferving this 
eclipfe were, a reflecting telefcope 21 inches focus 
with a micrometer, a refracting telefcope 6 feet in 
length with only two glafles, a double convex objeCt 
glafs, and a double convex eye glafs. Two pendu- 
lum clocks, and a flop watch to feconds of time. I 
had taken as much care as poflible to adjuft the clocks 
to mean folar time fome days before the eclipfe, and 
from feveral altitudes of the Sun, taken March 30th 
in the morning and afternoon, concluded the clocks 
were then exactly with the Sun to a fecond of time. 
March 31ft was a cloudy day, and not the lead: 
hope of feeing the Sun the day following, ’till near 
midnight, when it cleared up, and the ftars appeared. 
April 1 ft, the Sun rofe a little obfcured by vapours 
and thin clouds, which he became more free from 
as he advanced in altitude. 
At 6 h 56' per clock, I took the altitude of the Sun’s 
centre 2 ° 25' 20", from which obfervation the dock 
was 6 feconds of time before the Sun. 
At 6 h 59' per clock, I took the altitude of the 
Sun’s centre 12 0 50' 45", from which obfervation 
the clock was 4 feconds of time before the Sun. 
At 
