AN AIR PUMP
ALOIS KREIDL, PRAGUE; 19TH CENTURY
the lacquered brass mechanism on walnut verneered base with maker's (or retailer's) plaque, with old collection labels and painted inventory numbers -- with a domed alarm clock with electrical contacts, to demonstrate conditions in vacuum.
19in. (48cm.) long
AN AIR PUMP
ALOIS KREIDL, PRAGUE; 19TH CENTURY
the lacquered brass mechanism on walnut verneered base with maker's (or retailer's) plaque, with old collection labels and painted inventory numbers -- with a domed alarm clock with electrical contacts, to demonstrate conditions in vacuum.
19in. (48cm.) long
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