 Remove a, and open the slit by means of the milled head, not shown in cut, but which is at right angles to d d. When the slit is sufficiently open, the rest of the apparatus acts like an ordinary eyepiece, and any object can be focussed in the usual way....  A Text-book of Physiology - Page 192by Isaac Ott - 1907 - 815 pagesFull view - About this book
 | Jabez Hogg - 1867 - 1456 pages
...apparatus acts like an ordinary eye-piece, and any object can be focussed in the usual way. Having focussed the object, replace A, and gradually close the slit...bands or 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... | |
 | Henry Enfield Roscoe - 1870 - 514 pages
...apparatus acts like an ordinary eyepiece, and any object can be focussed in the usual way. Having focussed the object, replace a, and gradually close the slit...bands or lines can only be brought out by accurately focussing their own parts of the spectrum. This can be done by the milled head b. Disappointment will... | |
 | sir Henry Enfield Roscoe - 1869 - 396 pages
...apparatus acts like an ordinary eyepiece, and any object can be focussed in the usual way. Having focussed the object, replace a, and gradually close the slit...bands or lines can only be brought out by accurately focussing their own parts of the spectrum. APPEND. D.] M1CRO-SPECTROSCOPE. 179 This can be done by... | |
 | Edward Nugent - 1870 - 304 pages
...apparatus acts like an ordinary eye-piece, and any object can be focussed in the usual way. Having focussed the object, replace A, and 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... | |
 | Henry Enfield Roscoe - 1873 - 542 pages
...apparatus acts like an ordinary eyepiece, and any object can be focussed in the usual way. Having focussed the object, replace a, and gradually close the slit...bands or lines can only be brought out by accurately focussing their own parts of the spectrum. This can be done by the milled head b. Disappointment will... | |
 | sir Henry Enfield Roscoe - 1873 - 550 pages
...apparatus acts like an ordinary eyepiece, and any object can be focussed in the usual way. Having focussed the object, replace a, and gradually close the slit...improved by throwing the object a little out of focus. out by accurately focussing their own parts of the spectrum. This can be done by the milled head b.... | |
 | John Browning (F.R.A.S.) - 1878 - 80 pages
...apparatus acts like an ordinary eye-piece, and any object can be focussed in the usual way. Having focussed the object, replace A, and gradually close the slit...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
...; 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...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
...apparatus acts like an ordinary eye-piece, and any object can be focussed in the usual way. Having focussed the object, replace A, and gradually close the slit...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... | |
 | John Browning (F.R.A.S.) - 1882 - 108 pages
...improved by throwing the object a 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 by accurately focussing their own parts of the spectrum. This can be done by the milled head, B, Disappointment will... | |
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