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" 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 little from adjacent parts in refrangibility,... "
Optics: Light and Sight Theoretically and Practically Treated, with Their ... - Page 231
by Edward Nugent - 1870 - 268 pages
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Once a Week

Eneas Sweetland Dallas - 1870
...opaque ; or by sidereflec tor, bull's-eye, &c. Remove A, and open the slit by means of the milled-head, H, at right angles to D D. When the slit is sufficiently...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 till...
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Every boy's book: a complete encyclopædia of sports and amusements, ed. by ...

Every boy - 1881 - 904 pages
...opaque, or by side reflector, bull'seye, &c. Kemovc A, and open the slit by means of the milled head, n, at right angles to D D. When the slit is sufficiently...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...
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How to Work with the Spectroscope

John Browning (F.R.A.S.) - 1882 - 54 pages
...reflector, bull's-eye, &c. Remove A, and open the slit by means of the milled head, H, at right angles to 1) D. When the slit is sufficiently open the rest of...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...
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The Microscope: Its History, Construction, and Applications: Being a ...

Jabez Hogg - 1886 - 764 pages
...open the slit by means of the milled-head, not shown in cut, but which is at right angles .to D i>. When the slit is sufficiently open the rest of the...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...
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Discoveries and Inventions of the Nineteenth Century

Robert Routledge - 1893 - 681 pages
...opaque, or by side reflector, bull's-eye, &c. Remove A, and open the slit by means of the milled head, H, at right angles to D D. When the slit is sufficiently...usual way. Having focussed the object, replace A, F shows the position of the field lens of the eye-piece. and gradually close the slit till a good spectrum...
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Discoveries and Inventions of the Nineteenth Century

Robert Routledge - 1896 - 719 pages
...opaque, or by side reflector, bull's-eye, &c. Remove A, and open the slit by means of the milled head, H, at right angles to D D. When the slit is sufficiently...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...
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The Microscope: Its History, Construction, and Application, Being a Familiar ...

Jabez Hogg - 1898 - 704 pages
...opaque. Remove A, and open the slit by means of the milled-head, not shown in fignre, but which is at right angles to D D. When the slit is sufficiently open the rest of the apparatus acts as an ordinary eye-piece, and any object can be focussed in the usual way. Having focussed the object,...
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Discoveries and Inventions of the Nineteenth Century

Robert Routledge - 1903 - 820 pages
...opaque, or by side reflector, bull's-eye, &c. Remove A, and open the slit by means of the milled head, H, at right angles to D D. When the slit is sufficiently...any object can be focussed in the usual way. Having focusscd the object, replace A, and gradually close the slit till a good spectrum is obtained. The...
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A Text-book of Physiology

Isaac Ott - 1904 - 563 pages
...Illuminate with stage mirror if transparent. Kemove A and open the slit by means of the milled head H at right angles to D, D. When the slit is sufficiently...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 till a...
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A Text-book of Physiology

Isaac Ott - 1907 - 815 pages
...Illuminate with stage mirror if transparent. Remove A and open the slit by means of the milled head // at right angles to D, D. When the slit is sufficiently...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 till a...
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