Details
A 19th-Century Geissler-pattern radiometer,
-- 5in. (14.5cm.) high, with four mica plates, the upper bulb with amber knop, a fine Crookes; tube with fluorescent rock sample, with trade label for H.J. Redding & Co., 3 Argyll Place, London W., and two other tubes
See Colour Illustration
-- 5in. (14.5cm.) high, with four mica plates, the upper bulb with amber knop, a fine Crookes; tube with fluorescent rock sample, with trade label for H.J. Redding & Co., 3 Argyll Place, London W., and two other tubes
See Colour Illustration