THE COLLECTIONS OF JANET & JACK THORNTON
Wednesday, 12 - Monday, 24 November 2025
A Short & Mason black enamelled and gilt brass pocket 'Tycos' Verschoyle Transit* and a 70mm gunmetal prismatic survey compass on stem by the same maker.
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Lot Details
William Denham Verschoyle was an American mining engineer, inventor and patentee of this instrument in 1905, it was at the same time an Abney level and a prismatic compass with clinometer.
