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He taught at the top of his voice, thumped the blackboard with a pointer, was biting at the expense of a pupil who confused the angle BFC with the angle BFG, a moment later to volley forth a broad Irish joke which convulsed the class.
Since then the angle HBF is equal to PBA, and the angle BFG equal to QBC, it follows that the sine of the angle HBF will also have the same ratio to the sine of BFG, as the velocity of light in the medium A is to its velocity in the medium C. But these sines are the straight lines HF, BG, if we take BF as the semi-diameter of a circle.
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