Page "learned" Paragraph 19
from
Brown Corpus
Figures 1 to 3 show photographic and schematic views of the test stand and of two different models of the anode holder.
The cathode consisted of a 1/4'' '' diameter thoriated tungsten rod attached to a water cooled copper tube.
This tube could be adjusted in its axial direction by an electric drive to establish the required electrode spacing.
The anode in figure 2 was mounted by means of the anode holder which was attached to a steel plug and disk.
Argon was also blown at low velocities ( mass flow rate Af ) through a tube coaxial with the cathode as an additional precaution against contamination of the arc by air.
A plug and a tube with holes in its cylindrical walls divided the chamber above the porous plug into two parts.
This arrangement had the purpose to prevent heated gas to reach the thermocouple by natural convection.
Two pyrometers shown in figure 1 and 2 ( Pyrometer Instrument Co. Model 95 ) served for simultaneous measurement of the anode surface temperature and the temperature distribution along the anode holder.
Three thermocouples were placed at different locations in the aluminum disk surrounding the anode holder to determine its temperature.
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2.400 seconds.