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Books Books 1 - 6 of 6 on just sufficiently to bring the small hole a little within the focus of the objective.....  
" just sufficiently to bring the small hole a little within the focus of the objective. By this arrangement all extraneous light is prevented from passing up the body of the microscope, except what passes through the object. Unless this precaution be attended... "
Practical Microscopy - Page 252
by George Edward Davis - 1882 - 335 pages
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The Microscope and Its Revelations

William Benjamin Carpenter - 1875
...hole 1-ltith of an inch diameter. Slide the tube just sufficiently to bring the small hole a littlu within the focus of the objective. By this arrangement...extraneous light is prevented from passing up the body of tht; microscope, except what passes through the object. Unless this precaution be attended to, a false...
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The Monthly Microscopical Journal: Transactions of the Royal Microscopical ...

Microscopy - 1876
...which contains the objective, which has a hole, the one-sixteenth of an inch in diameter, cut in it. By this arrangement all extraneous light is prevented...microscope, except what passes through the object. I have tried examining objects both with and without this small piece of apparatus, and am quite convinced...
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The Monthly Microscopical Journal: Transactions of the Royal Microscopical ...

Microscopy - 1876
...which contains the objective, which has a hole, "the one-sixteenth of an inch in diameter, cut in it. By this arrangement all extraneous light is prevented...microscope, except what passes through the object. I have tried examining objects both with and without this small piece of apparatus, and am quite convinced...
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How to work with the spectroscope

John Browning (F.R.A.S.) - 1878
...containing the i^ or 2-inch objective a cap with a hole i-i6th of an inch diameter. Slide the tube just sufficiently to bring the small hole a little...obtained. Substances which give bands or lines in the red, are best seen by gaslight, while those which give bands in the blue are brought out far better by daylight....
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How to work with the spectroscope

John Browning (F.R.A.S.) - 1882
...containing the i| or 2-inch objective a cap with a hole i-i6th of an inch diameter. Slide the tube just sufficiently to bring the small hole a little...obtained. Substances which give bands or lines in the red, are best seen by gaslight, while those which give bands in the blue are brought out far better by daylight....
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Manual of Advanced Optics: By C. Riborg Mann

Charles Riborg Mann - Optical measurements - 1902 - 196 pages
...containing the i^ or 2-inch objective a cap with a hole i-i6th of an inch diameter. Slide the tube just sufficiently to bring the small hole a little...obtained. Substances which give bands or lines in the red, are best seen by gaslight, while those which give bands in the blue are brought out far better by daylight....
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