LXVIII.Theory of the high pressure mercury vapour discharge(B)

The high-pressure mercury-vapour discharge and its applications

“…These other constants may be chosen to give quite good quantitative results over a wide range of operating conditions. 34 Combinations of variables such as these provide a valuable method of correlating the characteristics of tubes operated under different conditions, and provide the basis of the "similarity" laws 35 -36 which have been studied in some detail. There are, however, two points worth mentioning here.…”

“…34 For practical purposes, the importance of the dynamic characteristic-that is the voltage/current or power/current charac- This, in its turn, is important because it determines the lamp power factor and its stability of operation. The latter contain excess mercury so that m cannot be held constant as P varies.…”