This auction is for a nearly perfect pocket barometer-altimeter(suveying), made for the U.S.Army Corps of Engineers in 1917. In almost unused condition. With leather case. This instrument has the revolving dial,(turned by knourled top knob), and a small bneedle pointer,(turned by bezel ring). Mint dial, original finish brass case,(darkened by using selenium dioxide, then lacquered, some call it"Japanned"). Silvered dial, graduated in inches of mercury, and feet of altitude. Remarkable condition, must have been hidden away in a drawer all these years. serial# of 6. 2 3/8" dial, 2 3/4" o.a. diameter. Original bevelled lense,(unscratched)."XXXIV" engraved on movement, back of dial, and inside back of case.
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.
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