 ... 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 198by sir Henry Enfield Roscoe - 1870Full view - About this book
 | Jabez Hogg - 1867 - 1456 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... | |
 | 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... | |
 | Edward Nugent - 1870 - 304 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... | |
 | John Henry Pepper - 1877 - 764 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... | |
 | 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... | |
 | 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... | |
 | Every boy - 1881 - 932 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... | |
 | Jabez Hogg - 1886 - 850 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... | |
 | 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... | |
 | 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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