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.<br />
3<br />
of the Solar Image formthat<br />
Light. This Image<br />
Oval, but terminated vr7ith<br />
Parallel Sides, and two Selnicircular<br />
Ends. On its Sides it was bounded<br />
pretty difIinAly, but on its Ends very confufed-<br />
1y and indiflim5tl.y g the Light there decaying<br />
and vanifhing by degrees. breadth of this<br />
Image anfwered to the Sun’ meter, and was<br />
about two Inches d the eighth part of an<br />
numbra. For the Image<br />
eet and an half diftant from the<br />
diftance that breadth if dinG3hcd<br />
by the Diameter of the hole in the<br />
IVindow-ihut, that is by a quarter of an I[nch,<br />
ended an Angle at the Prifm of about half.<br />
egree, -whicli is the Sun’s apparent Diameter.<br />
But the length of the Image was about ten<br />
Inches and a quarter, and the length of the We?<br />
Ailinear Sides about eight Tnches ; and the refraEting<br />
Angle of the IWin whereby fo great a<br />
length was made, was 64 degrees. With a lefs<br />
Angle the length of the Image was lefs, the<br />
breadth remaining.the fame. I[f the Prifm was<br />
ned about its Axis that n7ay which made the<br />
ys emerge more obliquely out of the kcond<br />
refrakting Surface of the Prifm, the Image Soon<br />
became an Inch or two longer, or more; and<br />
if the Prifin 1x721s turned about the contrary<br />
way, fo as to make the ‘Rays fill1 more obliguely<br />
on the firit refra&ing Surface, the Image ioon<br />
became an Inch or two fllorter. And thcrefore<br />
in trying this Experiment, I was as surious<br />
as I could be in placing the I?rifin by the<br />
x<br />
c-4 above-:>
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