Altitude difference measuring apparatus

Details Altitude difference measuring apparatus Altitude difference measuring apparatus

1980-01-04

1981-12-01

Woodiel, Donald O.

Measuring and testing

Barometer

73178T, 73717, 73DIG4, G01L 708, G01C 7100

Patent

active

043029736

ABSTRACT:
An altitude difference measuring apparatus for measuring the difference between the altitudes at a first and second points on the basis of the barometric difference between the points, having an air pressure holding section with an electromagnetic valve for hermetrically containing an amount of air. At the first place an amount of the ambient air is held hermetrically in the air pressure holding section, and at the second place the barometric difference between the air pressure in the air pressure holding section and the ambient air pressure is converted into an electric signal, and in accordance with the electric signal the difference between the altitudes at the first and second points is indicated.

REFERENCES:
patent: 3397581 (1968-08-01), Bush
patent: 3797308 (1974-03-01), Crane
patent: 3829640 (1974-08-01), Taylor
patent: 4226125 (1980-10-01), Waugh

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