Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 337
tance ; and Hossapplied this correction bymounting the front len&of an objective in a tubewhich slid over anothertube carrying the twoother pairs. There wasa small guide-pin in anL-shaped slot to limit theamount of movement; foruncovered objects, the frontcombination was drawnout and the pin… … Fig. 270.—Section of adjusting object-glass. the modern use of collar coklkction 307 q£, a screw arrangement, as in fig. _!70. The front pair of leu ea ifixed into a tube (A) which slides over an interior tube (I>) by whichthe other two pairs are held ; and it is drawn up or down by meansof a…
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