Читать книгу Essays on the Microscope - George Comp Adams - Страница 33

It will be obvious to the reader from the preceding description that it must be put together as represented in the figure; that he has to place the slider-holder, K, to the stage, N I S, with one slider of objects; to reflect as strong a light as possible from the concave mirror, O, below, by turning it into the best position, and moving it upwards or downwards all the while he is looking down the body, A B. Then, for a distinct view of the object, to turn the pinion, M, in a slow and gentle manner. A small degree of practice will render the management very familiar.

For opake objects, the slider-holder, K, is to be removed; the silver speculum, e, screwed to the arm, a, and by its pin placed in the hole, I, of the stage, with the concave part downward above the stage; the glass, o, or the nippers, b, with ivory, h, placed at the stage: then the light reflected from the mirror, O, up to the speculum above, which will again reflect the light very strongly upon the object. Practice also in this case can make it easy to the beginner. The use of the rest of the apparatus has been sufficiently explained.