I believe that the external power was a motor-driven HV generator - this was done for long duration tests and voltage stability as hand-cranking was not appropriate or practical. As it turned out, the motor-driven generators weren't particularly voltage-stable either !
This looks like a Megger series 1 without the internal generator and with the terminals at the top rather than at the side (which the cranked one has). Dates from around mid 1950s probably - these units were commonly used by Telcos to measure ground return resistance and the like...
This looks like a Megger series 1 without the internal generator and with the terminals at the top rather than at the side (which the cranked one has). Dates from around mid 1950s probably - these units were commonly used by Telcos to measure ground return resistance and the like...
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