Watch with barometric pressure indicator

Details Watch with barometric pressure indicator Watch with barometric pressure indicator

1979-10-10

1981-07-14

Weldon, Ulysses

Horology: time measuring systems or devices

Combined with disparate device

Ambient condition detector

368 10, 73170R, G04B 4700

Patent

active

042790280

ABSTRACT:
A solid state digital watch and barometric pressure indicator having a sealed quartz crystal and a second unsealed quartz crystal which changes frequency with atmospheric pressure changes. The frequency variation of the unsealed quartz crystal is measured over a selected (interrogation) period and some number proportional to the frequency variation, which is indicative of the magnitude of atmospheric pressure change, is displayed with an appropriate sign to indicate increasing or decreasing atmospheric pressure.

REFERENCES:
patent: 2716327 (1959-08-01), Franklin et al.
patent: 3355949 (1967-12-01), Elwood et al.
patent: 3653203 (1972-04-01), Hurt
patent: 3937004 (1976-02-01), Natori et al.
patent: 4015208 (1977-03-01), Hammer et al.
patent: 4163230 (1979-07-01), Konii

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