Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 342
I j … immersion system touched its highest point, apertures as great as1 23 were reached ; and in America, Spencer, Tolles, and Walesproduced some extremely fine lenses of large aperture. During the year 1869 Wenham experimented with and sug-gested 1 the employment of a duplex front; that is so say, a…
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