ee — 
Prof. Dean’s observations of the solar eclipse Sept. 1811. 251 
Not having a micrometer, between 15. and 20 minutes after 2, I 
took the greater breadth of the visible part in the octant, and found 
it 5’ on the extra arch, and 7 on the direct. This I repeated twice 
with the same result. 
At 0/, 15’ I hung out a shearer. which then stood at 74° on 
the south side of the house. At 12A. 30’ it rose to 83°. At 1%, 15, 
sometime before any perceptible diminution of light, it fell to 80°, and 
the diminution of heat was very obvious to the senses. At 2, 15’ 
it had fallen to 72°, and at the end of the eclipse it rose to 81°. 
Those outlines of bodies, which were parallel to a line joining the 
horns, cast a shadow strongly defined, while lines perpendicular to 
that exhibited a strong penumbra. The intersection of these lines 
exhibited a singular appearance. On the whole, the diminution of 
light was much greater than Iexpected. Making a random conjec- 
ture, I should represent it as dark as when the sun has descended 6° 
or 8° below the horizon. 
The latitude of the University, as near as I have been able to as- 
certain it from observation, is 44° 28’, and its longitude by estimation 
73° 12’ W from Greenwich. 
