 | Royal Society (Great Britain) - 1870 - 652 Seiten
...or, rather, half the focal length of the observing objective. (III.) That such test-images (which may be obtained conveniently two thousand times less than...which they are displayed (especially on the immersion system) is a marvellous test of the correction of the observing objective, but an indifferent one of... | |
 | Sir Norman Lockyer - 1870 - 652 Seiten
...or, rather, half the focal length, of the observing objective. III. That such test-images (which may be obtained conveniently two thousand times less than...which they are displayed (especially on the immersion system) is a marvellous test of the correction of the observing objective, but an indifferent one of... | |
 | Sir Norman Lockyer - 1870 - 548 Seiten
...or, rather, half the focal length, of the observing objective. III. That such test-images (which may be obtained conveniently two thousand times less than...which they are displayed (especially on the immersion system) is a marvellous test of the correction of the observing objective, but an indifferent one of... | |
 | Royal Society (Great Britain) - 1870 - 656 Seiten
...or, rather, half the focal length of the observing objective. (III.) That such test-imnges (which may be obtained conveniently two thousand times less than...which they are displayed (especially on the immersion system) is a marvellous test of the correction of the observing objective, but au indifferent one of... | |
 | Royal Society (Great Britain) - 1870 - 688 Seiten
...or, rather, half the focal length of the observing objective. (III.) That such test-images (which may be obtained conveniently two thousand times less than a known original) are formed (under precaution*) with a remarkable freedom from aberration, which appears to be reduced in the miniature... | |
 | 1870 - 492 Seiten
...or, rather, half the focal length of the observing objective. III. That such test-images (which may be obtained conveniently two thousand times less than...original) are formed (under precautions) with a remarkable freedon from aberration, which appears to be reduced in the miniature to a minimum. IV. The beauty... | |
 | 1870 - 570 Seiten
...or, rather, halt the focal length of the obaervina-objective. (III.) That such test-images (which may be obtained conveniently two thousand times less than...which they are displayed (especially on the immersion system) is a marvellous test of the correction o'f the observing objective, but an indifferent one... | |
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... spherical aberration is positive or negative. (II.) That test-images may be formed of a high order of delicacy and accurate portraiture in miniature, by employing an objective of twice the focal depth, or, rather, half the focal length of the observing... 