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We took a Cylinder of Caft Brass Fig I. ABCD; and cut one end of it CD perpendicular to the Axis the ax, the other end AB enclin'd to it at an Angle of about 27° 30'. and therefore the Perpendicular to this enclining plain, pc, and the Axis of the Cylinder ax comprehended an Angle pca of about 620. 30d.

I. An experiment of the refraction of the air made at the command of the Royal Society, Mar 28. 1699