...to admit the quantity of light required to form the second spectrum. Light, entering the round hole near E, strikes against the right-angled prism which...placed in a suitable position with reference to the round hole, its spectrum will be obtained, and will be seen on looking through it. F shows the position...

...for holding small tube, that the spectrum given by its contents may be compared with that from the other object on the stage. E, a screw, opening and...suitable position with reference to the aperture, it spectrum will be obtained, and will be seen ou looking through it. r, shows the position of the...

...larger head, and when once recognized cannot be mistaken for the other. DD, an apparatus for holding a small tube, that the spectrum given by its contents...obtained, and will be seen on looking through it. G is a tube made to fit the microscope to which the instrument is applied. To use this instrument,...

...second spectrum. A light entering the round hole near X strikes against the rightangled prism, which is placed inside the apparatus, and is reflected up through...to the compound prism. If any incandescent object be placed in a suitable position with reference to the round hole, its spectrum will be obtained. F...

...second spectrum. A light entering the round hole near E strikes against the rightangled prism, which is placed inside the apparatus, and is reflected up through the slit belonging to the conjpound prism. If any incandescent object be placed in a suitable position with reference to the...