I've been in communication with members of the Livermore Heritage Guild and hopefully some more technical information will be coming.

So far the persons I've corresponded with are not aware of any special power source, only that a backup has existed for many years.

Also:
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I forgot to say the filament is different.... I have heard both Carbon and Carbide used. It looks like it is quite heavy when the light is on... actually it is quite fine.

Bill


Bill