細節
An aurora borealis tube with valve and vacuum pump,
on mahogany base -- 11in. (28cm.) wide, the tube with pump 47in. (119.3cm.) high; and a mercury interrupter, the iron reservoir with gilt decoration, winding handle, friction wheel, vulcanite interrupter switch, valves and carrying handle -- 19in. (48.3cm.) high (C) (2)
on mahogany base -- 11in. (28cm.) wide, the tube with pump 47in. (119.3cm.) high; and a mercury interrupter, the iron reservoir with gilt decoration, winding handle, friction wheel, vulcanite interrupter switch, valves and carrying handle -- 19in. (48.3cm.) high (C) (2)