Details
A 19th-Century oxidised-brass heliostat,
by Edward Kbel Mathematical Instrument Maker Washington DC, the braced frame with three levelling screws, with arc engraved 45°-25°, the clockwork mechanism contained in a 3.3/4in. (9.5cm.) dia. drum, driving the engraved brass dial and articulated mechanism with mirror, adjustable for elevation with sliding pillar and screw clamp, the base plate with maker's impressed trade-mark and universal bubble-level, the base -- 10in. (25.4cm.) long
See Colour Plate 1
by Edward Kbel Mathematical Instrument Maker Washington DC, the braced frame with three levelling screws, with arc engraved 45°-25°, the clockwork mechanism contained in a 3.3/4in. (9.5cm.) dia. drum, driving the engraved brass dial and articulated mechanism with mirror, adjustable for elevation with sliding pillar and screw clamp, the base plate with maker's impressed trade-mark and universal bubble-level, the base -- 10in. (25.4cm.) long
See Colour Plate 1