Geissler tubes

On vaporising sulphur in a cooled hydrogen flame, or on passing feeble electric sparks through the vapour contained in a Geissler tube, a band spectrum is obtained consisting of a series of bands sharp on the... 

It has now been established that the emission spectrum of the element lies in the ultraviolet. Prominent lines in the are and spark spectra are found at A =2555-7, 2554-0, 2536-4, 2534-75 A. These are also seen in the spectra from the vapour in a Geissler tube, and in addition other lines at 2497-3 and 2484-1.3 A photographic record of the condensed spark spectrum showed lines at 2555-0, 2553-3, 2535-6, 2534 A.4... 

Geissler, Heinrich (1814-1879). A Ger physicist who determined the coefficient of expansion of water and invented the so-called Geissler Tube, It is a partly evacuated glass tube used in the study of electric discharges thru gases and for spectroscopic examinations Ref Hackh s Diet (1944), p 372-L... 

Electroluminescence is a familiar phenomenon since the introduction of the Geissler tubes for making gases incandescent for spectro-... 

Write or draw on white a letter or design, using a solution of sulphate of quinine as the ink when dry this will be quite invisible. But if the same be exposed in the dark to the light of a vacuum or Geissler tube, the design or writing wiU appear in a blue violet. 

Ionization gauge Geissler tube Mercury manometer... 

Pulfrich Refractometer.—The Pulfrich refractometer (as made by Zeiss) is shown in Fig. 34, the instrument bemg viewed from behind in order to show the optical parts. This instrument is arranged for illumination either by a coloured flame or by means of a Geissler tube (Q). 

When it is desired to use a Geissler tube as the source of illumination, the latter (Q) is clamped to the standard c, so that the end of the capillary is opposite the middle of the lens P, whereby the light is focussed on the cell. ... 

The chief lines of the hydrogen spectrum which one sees, are a bright red line on the extreme right (C line), a pale blue line (F line), and, on the extreme left, two violet lines (G and G"). If, as is frequently the case, a little mercury is placed in the Geissler tubes, one also sees several lines between the C and the F lines, more especially a green line (one of the mercury lines). Measurements are generally confined to the C, F, and G lines of the hydrogen spectrum. ... 

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