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" ... focussed in the usual way. Having focussed the object, replace A, and gradually close the slit till a good spectrum is obtained. The spectrum will be much improved by throwing the object a little out of focus. Every part of the spectrum differs a... "
Spectrum analysis, 6 lects - Page 198
by sir Henry Enfield Roscoe - 1870
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The Microscope: Its History, Construction, and Application, Being a Familiar ...

Jabez Hogg - 1867 - 1458 pages
...sufficiently open the rest of the apparatus acts like an ordinary eye-piece, and any object can be focussed in the usual way. Having focussed the object,...lines can only be brought out by accurately focussing that particular part of the spectrum. This can be done by the milled head B. Disappointment will occur...
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Cyclopadic Science Simplified

John Henry Pepper - 1869 - 722 pages
...apparatus acts like an ordinary eye-piece, and any object can be focused in the usual way. Having focused the object, replace A, and gradually close the slit...bands or lines can only be brought out by accurately focusing their own parts of the spectrum. This can be done by the milled head B. Disappointment will...
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Optics: Light and Sight Theoretically and Practically Considered, with Their ...

Edward Nugent - 1870 - 268 pages
...sufficiently open, the rest of the apparatus acts like an ordinary eye-piece, and any object can be focussed in the usual way. Having focussed the object,...gradually close the slit till a good spectrum is obtained. Every part of the spectrum differs a little from adjacent parts in refrangibility, and delicate bands...
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Cyclopædic science simplified

John Henry Pepper - 1877 - 766 pages
...apparatus acts like an ordinary eye-piece, and any object can be focused in the usual way. Having focused the object, replace A, and gradually close the slit...bands or lines can only be brought out by accurately focusing their own parts of the spectrum. This can be done by the milled head B. Disappointment will...
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How to work with the spectroscope

John Browning (F.R.A.S.) - 1878 - 80 pages
...sufficiently open the rest of the apparatus acts like an ordinary eye-piece, and any object can be focussed in the usual way. Having focussed the object,...little out of focus. Every part of the spectrum differs slightly from adjacent parts in refrangibility, and delicate bands or lines can only be brought out...
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Once a Week

Eneas Sweetland Dallas - 1870 - 532 pages
...apparatus acts like an ordinary eye-piece, and any object can be focused in the usual way." Having focused the object, replace A, and gradually close the slit...spectrum is obtained. The spectrum will be much improved, how[August i 3, 1870. ever, by throwing the object a little out of focus. Every part of the spectrum...
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Every boy's book: a complete encyclopædia of sports and amusements, ed. by ...

Every boy - 1881 - 904 pages
...sufficiently open, the rest of the apparatus acts like an ordinary eye-piece, and any object can be focussed in the usual way. Having focussed the object,...little out of focus. Every part of the spectrum differs slightly from adjacent parts in refrangibility, and delicate hands or lines can only be brought out...
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The Microscope: Its History, Construction, and Applications: Being a ...

Jabez Hogg - 1886 - 848 pages
...sufficiently open the rest of the apparatus acts like an ordinary eye-piece, and any object can be focussed in the usual way. Having focussed the object,...refrangibility, and delicate bands or lines can only bo brought out by accurately focussing that particular part of the spectrum. This can be done by the...
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The Microscope: Its History, Construction, and Application, Being a Familiar ...

Jabez Hogg - 1898 - 780 pages
...Figs. 197 and 197a.— The Beck-Sofhy Micro-spectroscope Eye-piece, drawn on a scale of one half size. replace A, and gradually close the slit till a good...lines can only be brought out by accurately focussing that particular part of the spectrum. This can be done by the milled-head B. Disappointment will occur...
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A Text-book of Physiology

Isaac Ott - 1907 - 852 pages
...apparatus acts like an ordinary eyepiece, and any object can be focused in the usual way. Having focused the object, replace A and gradually close the slit...bands or lines can only be brought out by accurately focusing their own parts of the spectrum. This can be done by the milled head B. AVhen spectra of very...
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