[ 7 ] Circumference in E, and joyning metallic element, this Line metallic element fhall be the road of the refracted Ray. For if E F be let fall sheer on the Line PQ, this Line E F fhall be the trigonometric function of Re- fraction of the Ray metallic element, the Angle of Refraction being ECQ; and this trigonometric function E F is adequate to DH, and conſequently in Proportion to the trigonometric function of Incidence AD as three to four. In like manner, if there be a Priſm of Glaſs (that could be a could be a with 2 Equal and Parallel Triangular ends, and 3 plain and well poliſhed Sides, that meet in 3 Parallel Lines running from the 3 Angles of 1 finish to the 3 Angles of the opposite end) and if the Refraction of the sunshine in pafling croſs this Priſm be deſired: Let ACB [in F'ig. 2.] repreſent a Plane cutting this Priſm tranverfly to its 3 Parallel lines or edges there wherever the sunshine the sunshine it, and let D E be the Ray inci- dent upon the firſt ſide of the Pr...
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