Die elektrodenverluste in der quecksilber-hochdruckentlandung

✍ Scribed by W. Elenbaas

• Publisher: Elsevier Science
• Year: 1936
• Weight: 528 KB
• Volume: 3
• Category: Article
• ISSN: 0031-8914
• DOI: 10.1016/s0031-8914(36)80319-x

✦ Synopsis

The sum of the anode-and cathodcfall V A+K in the high pressure mercury discharge (oxide-coated electrodes heated by the discharge) is measured by running two discharges of different length in one tube. In this way the vapour pressure in the two discharges is the same. It appears, however, that in the vertical position of the tube, the gradient in the upper discharge is smaller than in the lower one. V A +K is therefore determined by the following two methods: 1 0 by taking the mean of the values obtained with the longer and the shorter discharge upside; 2 0 by running the tube in a horizontal position and maintaining the discharge in the axis of the tube by means of a horziontalmagnetic field. It follows that VA +K rises with increasing pressure and decreasing current. Oscillographs of the voltage on the two discharges in the case of alternating current, when the deflection per Volt is made inversely proportional to the length of the discharge, show that VA +K does not depend much on the phase angle.