Identifier: s1philosophicalmag58londuoft (find matches)
Title: The Philosophical magazine; a journal of theoretical, experimental and applied physics
Year: 1798 (1790s)
Authors:
Subjects: Physics
Publisher: London Taylor & Francis (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: Ontario Council of University Libraries and Member Libraries

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On Refraction. 249 which cannot be accomplished at once on the potters wheel.One man and a boy are capable of making from ten to twelveliundred per day. The principle is peculiarly adapted for theformation of a number of chemical apparatus, muffles, retorts,tubes, &;c. LIV. On Refraction. By J. Reade, M,D.To Dr. Tilloch. Sm, — A. VERY common experiment, no less interesting thansurprising, is shown in lecture-rooms for the purpose of illustratingthe theory of refraction. A piece of money is placed at the bot-tom of an empty basin, the experimenter retiring until the edgeintercepts the object: an assistant then pours in water; the pieceof money seems to rise over the edge, becoming perfectly visibleand well defined. This experiment seldom fails to surprise theaudience, handed down from one generation to another, evenfrom the days of Aristotle; yet I am led to believe the real causeis little understood. Mr. Harris gives the following explanationin his Optics, page 25 : Hence (says

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