SHORT&MASON"TYCOS""C&T"ALTITUDE BRASS BAROMETER 2 hands Start Price USD 275.00 Current Price USD 275.00 Time Left - Bid Count 0 Buy It Now Price - Reserve Price - Start Time Monday, October 06, 2008 End Time Monday, October 20, 2008 Location Grand Junction, Colorado See more about 'SHORT&MASON"TYCOS""C&T"ALTITUDE BRASS BAROMETER 2 hands' Description This auction is for a very early SHORT&MASON barometerv with the unique,(and RARE), "C&T" patented dual hands. These were used tondisplay TRUE barometric pressure, and the "COMPENSATED FOR ALTITUDE" barometric pressure before the clever TAYLOR borthers came up with their "STOROGUIDE" type of barometers that utilized a moveable dial to set altitude. How this particular instrument works is quite simple, as there are twin needles, the"black one" is set for true sea level pressure, and you swing the other "red" needle to reflect your altitude difference, thus reading both at once,(this instrument is currently set to reflect an 800 foot diference between sea level and ambient altitude). Both nnedles are made of super light,(and thin) spring steel, so the react as one somewhat heavier thick needle. The dial is thick fired porcelain, hand painted and calligraphied. The lense is I think original, as it has many "occlusions", but it also shows scratching. I PERSONALLY THINK THE SCRATCHES ARE WORTH IT, AND MAY ALSO BE ORIGINAL. "moon&arrow" set and indicator hands, indicator hand has "C&T" badge firmly setted, and rotates with knob as it should.Perfect early case and bezel ring.Stand NOT included, but available for purchase in my ebay store.Free priority mail shipping at ull listing price with immediate paypal payment. Book page is from the book"WEATHER", written by PR JAMESON in 1908 for the TAYLOR INSTRUMENT COMPANIES, and illustrates this PARTICULAR RARE instrument..I would guess the vintage of this instrument to be somewhere between 1900 and 1910, as it does NOT APPEAR in my 1912 second edition book. This book is also available in my EBAY store.It is full of VERY useful information on dating various instruments, as well as info on weather predicting in the"old school" methods.Pictures numbered 11&12 are of the movement in this,(notice the inside of the case in #12 is polished from the factory?). Shows excellent craftsmanship.GUARANTEED This instrument has been ultrasonically cleaned, then sparingly lubricated with moebious clock oil to provide many years of trouble free service in weather predicting aboard your vessel. Finally it has been precision calibrated in my IDEAL-AEROSMITH calibration chamber to provide complete accuracy.Check out the calibration report for assurance of accuracy. READ THE "ABOUT ME" PAGE FOR PICTURES OF MY CHAMBER AND GAUGE CALIBRATION BENCH THE REASON FOR THE"STRANGE" READING ON THE DIALS OF MY INSTRUMENTS IS THAT I LIVE AT 4400 FEET ABOVE SEA LEVEL. THE AVERAGE AMBIENT BAROMETRIC PRESSURE IS 25.5" or 860 millibars. Place a Bid!