SHORT & MASON POCKET BAROMETER ALTIMETER

Updated August 29, 2026

EARLY 1900'S SHORT AND MASON, LONDON ANEROID BAROMETER ALTIMETER. BRASS FRAME WITH INTACT GLASS, HANGING RING TO TOP. THE FACE MARKED COMPENSATED 'TYCOS' / SHORT & MASON LONDON'. MADE BY TAYLOR INSTRUMENTS CO., LONDON UNDER THEIR 1908 TYCOS TRADEMARK. THE OUTER CHAPTER RING IS MARKED FROM 0 - 8000 FEET AND INDICATES THE HEIGHT ABOVE SEA LEVEL. THE INNER RING IS MARKED FROM 23 - 31 INCHES AND INDICATES ATMOSPHERIC PRESSURE IN INCHES OF MERCURY. TO MEASURE YOUR HEIGHT, YOU ROTATE THE OUTER CHAPTER RING UNTIL THE HAND IS ALIGNED WITH THE ZERO (ASSUMING YOU ARE AT SEA LEVEL), THEN AS YOU CLIMB, THE HAND MOVES DUE TO THE FALL IN AIR PRESSURE AND YOU WILL BE ABLE TO READ OFF THE HEIGHT YOU HAVE REACHED. THE WORD 'COMPENSATED' INDICATES THAT THIS BAROMETER ADJUSTS THE READING FOR CHANGES IN TEMPERATURE, THEREBY GIVING A MORE ACCURATE READING. UNTESTED NOTE SOME WEAR AND DISCOLOURATION COMMENSURATE WITH AGE AND USE 2 3/4" X 2" X 5/8"

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See all lots in Spooner Estate Auctions - September 14th, 2026 →