Brewster, David, Sir, 1781-1868, Bache, A. D. (Alexander Dallas), 1806-1867 · Philadelphia : Lea and Blanchard · leaf 212
208 A TREATIBE ON OPTICS. PART II. lated to certain fixed points within the crystal. In the middleof the crystal, half way between m and n, there are only//refrinj ea or orders of colors; at points equi-distant from thisthere are six fringes, the sixth returning into itself in theform of an oval.…
Optics
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