Wauchope, Joseph Alliene, 1873- · Chicago, Scott, Foresman and Company · leaf 101
laneside being opaque with a vertical slit in the centerthrough which light may pass, the half-circle beingtransparent and graduated in degrees; candle; com-pass. Directions.— Fill the vessel one-third full of waterand place the lighted candle in the position shown inthe diagram. The incident beam… … refracted and will go to B. Take the readings of A andB in degrees, counting from X, the zero of the scale. With compass, rule, and sharp pencil, lay off on apage of your notebook an accurate reproduction ofthe half-circle and the lines CO, OA, and OB. Drawthe line XY perpendicular to the plane…
Physics
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