Tyndall, John, 1820-1893 · New York : Appleton · leaf 206
the centrethey squeeze the glass; when they recoil they strain it.Thus while at the ends we have the maximum of vibration,but no change of density, at the centre we have the maxi-mum changes of density, but no vibration. We have now cleared the way for the introduction of avery beautiful experiment… … spar, a beam of polarized light is obtained. This beamimpinges on a second prism of spar, n, but, though bothprisms are perfectly transparent, the light which has passed 198 SOUND. through the first cannot get through the second. B\introducing a piece of glass between the two prisms, andsubjecting…
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