£500 - £800
Pilkington & Gibbs Ltd, Preston - an early 20th century brass heliochronometer sundial, believed type 5. The angled rotating plate with fixed backsight and pinhole foresight, adjusted via a disc calibrated for the date to allow a reading for mean time to be taken from the circumference via a sector divided for minutes, against a movable hour scale. The mechanism mounted onto a cast brass bowl fixed via an adjustable pivot for setting latitude onto base. Raised on wooden base.
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