Granite, never heard of that as an insulator nor of Carbon filament synchrometer (synchroscope?) - not French by any chance?
(Don't worry about JJ's teasing. I'll think of a riddle for tomorrow if E-S doesn't beat me to it)
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David V
Lord Finchley tried to mend the electric light
Himself. It struck him dead and serve him right
It is the duty of the wealthy man
To give employment to the artisan
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