細節
G. DAVIS, Leeds
An electro-induction instrument, with twin coils mounted on central pillar on circular mahogany base with scale divided 1-8 and signed Invented by G. Davis, Leeds -- 7in.(18cm.)diam.; and a Geissler tube demonstration instrument (2)
An electro-induction instrument, with twin coils mounted on central pillar on circular mahogany base with scale divided 1-8 and signed Invented by G. Davis, Leeds -- 7in.(18cm.)diam.; and a Geissler tube demonstration instrument (2)
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See illustration