细节
A Daniell's hydrometer
12in. (30.5cm.) high; an x-ray tube by Newton & Co 15in. (38.1cm.) long; three galvanometers, two amperemeters and other items (A Lot)
12in. (30.5cm.) high; an x-ray tube by Newton & Co 15in. (38.1cm.) long; three galvanometers, two amperemeters and other items (A Lot)