Abstract
The steadying effect of a metallic anchor for the cathode spot of a mercury-pool arc has been used to make measurements on the force at the cathode. Two methods have been used. One was based on the depression of the meniscus edge carrying the cathode line, due to the pressure on it. This measured only the horizontal component which was exerted on the liquid and gave 19 dynes/amp. The other used a torsion pendulum to measure the total horizontal force component and gave 33 to 43.5 dynes/amp. over the current range zero to 10 amp. This was supplemented by a determination of the direction of the force based on the deflection of the cathode line by a magnetic field, giving 35 to 66 dynes/amp. for the resultant in the same current range. The results show interaction of current streams from different emitting areas to increase the force, and are not inconsistent with other determinations.
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