s it may at first appear, may be illustrated by will produce no effect on the polarized beam, but most The best position for the polarizing plate is near a apparatus costing less than a dime, in a manner that thick pieces of glass, such as paper weights, ink stands, window, with the broad light of… … by blacking one side of each glass GLASS STRAINED BY PRESSURE. with asphaltum varnish or any other convenient black varnish or paint, using in the experiments the unblackened sur- faces, as shown in Fig. 1. The angle which the incident light beam should make with the polarizer or horizontal…
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