. Carnegie Institution of Washington publication. 12 INFLUENCE OF A MAGNETIC FIELD UPON THE SPARK SPECTRA OF IRON AND TITANIUM. Fig. 2. (b) A stronger light from the spark was obtained for observation along the axis by not insulating the pole-tips, using one solid and the other pierced as in (a), with the spark between iron tips at the ends of brass rods held vertically between the magnet poles by means of a wooden frame or the brass and fiber holder described on p. lo. Titanium terminals were held in the simple clamp described above. This worked well for getting the "longitudinal effect&
. Carnegie Institution of Washington publication. 12 INFLUENCE OF A MAGNETIC FIELD UPON THE SPARK SPECTRA OF IRON AND TITANIUM. Fig. 2. (b) A stronger light from the spark was obtained for observation along the axis by not insulating the pole-tips, using one solid and the other pierced as in (a), with the spark between iron tips at the ends of brass rods held vertically between the magnet poles by means of a wooden frame or the brass and fiber holder described on p. lo. Titanium terminals were held in the simple clamp described above. This worked well for getting the "longitudinal effect" (^-component) without the introduction of a Nicol prism in the optical system. Such an end-on arrangement is of course necessary for the study of the circular polarization of Zeeman components. However, for general work in measuring the separation of components, this method has the disadvantage that there is a considerable increase of field-intensity close to the magnet poles, amounting with some gaps to 25 per cent, as well as an inequality at the two poles resulting from one of them being pierced, so that the sharpness of the Zeeman components is not all that could be wished. (c) The most useful method, and that used (with varying shapes of the pole-tips) for almost all of the best observations, was to set the magnet at right angles to the direction at which the Hght was observed, use both pole-pieces solid, and separate the light by means of a Nicol prism over the sUt into that vibrating in a plane at right angles to the magnetic force-lines, or parallel to these. This arrangement made it possible to photograph successively the Zeeman components given respectively by vibrations perpendicular and parallel to the force-lines by turning the Nicol prism through 90°, leaving the magnet unchanged. Furthermore, by projecting the image so that only the hght from that part of the spark midway between the magnet pole-pieces falls upon the slit of the spectrograph, the change of
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