A 19th Century mahogany framed galvanometer, unsigned, on three adjustable feet - 15in (38cm) high; a lacquered brass thermopile signed Elliott Bros 30 Strand London; and another signed Griffin London (3)
A 19th Century mahogany framed galvanometer, unsigned, on three adjustable feet - 15in (38cm) high; a lacquered brass thermopile signed Elliott Bros 30 Strand London; and another signed Griffin London (3)
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