How to See With the Microscope Being Useful Hints Connected With the Selection
How to See With the Microscope Being Useful Hints Connected With the Selection
J Edwards Smith
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It will now have assumed a position in- termediate between the horizontal and the vertical. Attempt, by slight changes in the position of the mirror, to display simultaneously both sets of lines. The inch ocular may now be substituted in place of the two inch. To do this nicely, getting both sets with equal force, requires indeed some little " knack. " The collar ad- justment being already correct, the manipulation will entirely be confined to the illumination. Possibly it 18 Microscopy. 274 HO...W TO SEE WITH THE MICROSCOPE. may be well to shove the lamp a little farther away from you ; i. E. , a little more in advance of the front edge of the stage, or perhaps raising or lowering the wick, thus increasing or diminishing the amount of light, may be of service. This is all that can be written, and the learner must simply make the most of and help himself. Rest assured that both sets of lines are there, and if it be that they are not shown, the diatom is not to blame. In case of total failure the observer may select one of the larger shells, proceeding to the smaller one?
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