Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 220
uter tube an ob-long slit is made, asseen at d, into whichprojects a smalltongue screwed onthe inner tube ; at the side of the former two horizontal lines areengraved, one pointing to the word uncovered, the other to theword covered; whilst the latter is crossed by a horizontal mark,which is… … Section of Adjusting Object-Glass. 16G MANAGEMENT OF THE MICROSCOPE. rotation of the screw-collar, whereby the outer tube is moved up ordown. When the mark has been made to point to the line un-covered, it indicates that the distance of the lenses of the object-glass is such as to make it suitable…
Microscopy · Biology
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