细节
A spectrometer,
by W. & J. George and Becker Ltd, in case -- 17¼in. (43.8cm.) wide; another spectrometer, in mahogany case -- 17in. (43.2cm.) wide; and two other philosophical demonstration apparatus (A Lot) (4)
by W. & J. George and Becker Ltd, in case -- 17¼in. (43.8cm.) wide; another spectrometer, in mahogany case -- 17in. (43.2cm.) wide; and two other philosophical demonstration apparatus (A Lot) (4)