Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 338
inga wide-angled, close-working objectivethere was a danger of forcing the frontlens through the cover-glass by meansof the collar correction. Now the object in the arrangementas shown in fig. 270a enables thefront lens to maintain a fixed position,while the correctional collar acts on theposterior… … Fig. 270a.—Present collarcorrection. 308 objectives, eye-pieces, the apektometek be 0-18 mm. thick, the correctional collar should be set to thedivision marked 0*18. I ii England, on the contrary, the divisions are entirely empirical, sothat the operator has to discover for himself the proper…
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