April 24, 2024
EXTREMELY RARE: ASTEN'S PATENT POCKET BAROMETER & ALTIMETER
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- Source eBay UK
EXTREMELY RARE 'ASTEN'S PATENT' BRASS ANTIQUE ANEROID POCKET BAROMETER & ALTIMETER TOGETHER WITH A COPY OF THE PATENT APPLICATION DATED 1907. THE PATENT ALLOWS FOR AN ENLARGED SCALE AND AN ADDITIONAL SECONDARY DIAL FOR EXTREMELY ACCURATE ALTITUDE READINGS. THE BAROMETER DIAMETER IS 6.5 CM WITH A POLISHED BRASS CASE, BLUED STEEL POINTER AND BEVELLED GLASS COVER ALL IN GOOD CONDITION. THE DIAL IS SILVERED AND VERY CLEAN WITH JUST A FEW LIGHT SURFACE SCRATCHES. IT IS ENGRAVED 'ASTEN'S PATENT NO 2853' THE DATE '1907' AND SERIAL NUMBER '28' THE INNER SCALE READS PRESSURE FROM 22 TO 31" AND THE OUTER SCALE ALTITUDE FROM 0 TO 9,000 FEET. ROTATING THE BEZEL ADJUSTS THE ALTITUDE SCALE. THE SECONDARY DIAL READS ALTITUDE FROM 0 TO 200 FEET AND IS MARKED 'ASCENT AND DESCENT'. THE BAROMETER IS IN WORKING CONDITION & PASSES THE 'PLASTIC BAG TEST' BUT THE SECONDARY DIAL HAS NO POINTER OR SPINDLE SHOWING THROUGH THE HOLE IN THE DIAL. I HAVE NOT OPENED UP THE BAROMETER TO CHECK INSIDE BUT SOME WORK CLEARLY NEEDS TO BE DONE ON THIS INSTRUMENT SO IT IS BEING SOLD 'AS IS'. ONCE COMPLETED THIS INSTRUMENT WILL NO DOUBT BE EXTREMELY VALUABLE AND AN ALMOST CERTAINLY UNIQUE ITEM IN ANY COLLECTION. PAYMENT: PAYPAL POSTAGE: TO UK 1ST CLASS RECORDED £5.95 TO REST OF WORLD AIRMAIL SIGNED FOR & INSURED £14.95
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