細節
A late 18th-Century double thermometer,
signed on the silvered-brass plate WATKINS & HILL Charing Cross LONDON, the upper scale graduated 0°-125°, with mercury-filled tube, the lower alcohol-filled tube with similar temperature range, the mounting plate -- 9¼in. (23.5cm.) long
signed on the silvered-brass plate WATKINS & HILL Charing Cross LONDON, the upper scale graduated 0°-125°, with mercury-filled tube, the lower alcohol-filled tube with similar temperature range, the mounting plate -- 9¼in. (23.5cm.) long