Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 272
7 244 ACCESSORY APPARATUS into the grooved nose-piece. These adapters, which are wedge-shapedand face up, have two novel features, the first being that they are each fitted with rectangular centringadjustments, which permit the objec-tives to be centred to one another;and the second is, that they…
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