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細節
A nickel-plated brass 'London-Dome' ear trumpet,
with pierced grille and ivory earpiece, unsigned; an oxidised-brass ear trumpet with extension piece, signed R.J. Dowling London, with ebonised earpiece -- 13in. (33cm.) long extended; and another extending ear trumpet, with funnel and vulcanite earpiece, the funnel impressed with a trademark -- 14in. (35.6cm.) long extended
See Illustration (3)
with pierced grille and ivory earpiece, unsigned; an oxidised-brass ear trumpet with extension piece, signed R.J. Dowling London, with ebonised earpiece -- 13in. (33cm.) long extended; and another extending ear trumpet, with funnel and vulcanite earpiece, the funnel impressed with a trademark -- 14in. (35.6cm.) long extended
See Illustration (3)