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petalled brass rivet with gnomon hole plugged
with handsome patina
Superb optics
Metal on instrument and top shows reasonable wear from military use
Cased Trough Compass by Hilger & Watts, Ltd. monocular petalled brass rivet with gnomonWooden Cased Trough Compass by Hilger & Watts Ltd. English made, circa 1950. Trough Compasses were used to accurately align other instruments such as a plane table, theodolite, etc. to magnetic north. Encased in gilded wooden box, with sliding lid. The magnetized steel needle is aligned with brass bar to locate true North (opposite end shows South). An early, pre serialized piece by well known, British opticians & scientific instrument makers, Hilger
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