Indicating instruments

Details Indicating instruments Indicating instruments

1975-08-22

1976-09-07

Woodiel, Donald O.

Measuring and testing

Barometer

Aneroid

116DIG43, G01L 710, G01C 2100

Patent

active

039787303

ABSTRACT:
An altimeter has a rotatably-mounted index that is driven to rotate through one complete revolution around a scale for each change of 1,000 feet in altitude sensed by two evacuated manometric capsules the number of revolutions of the index is indicated by numerical markings visible through an arcuate window which breaks into the scale against a `zero` arrowhead at the top-center of the scale. The markings are distributed around the opaque circumferential-margin of a transparent disc that is mounted coaxially with the index and is driven in the counter direction to the index through step-down gearing. Successive ones of the numerical markings are rotated to the zero arrowhead to indicate the number of units of 1,000 feet appropriate to the altitude measurement, upon successive revolutions of the index. At least two of the markings are revealed in the window at any time so that throughout the transition between one revolution and the next of the index, for which the index is in the region of the zero datum, the relationship of the index to the revealed markings signifies which of those markings is appropriate to the altitude measurement at that time. Graduations of the disc intermediate the numerical markings are visible along an arcuate boundary of the window throughout a final sector of each revolution of the index to the zero datum, but are obscured by a step in the initial sector of the window where it extends on beyond the zero datum, so as to avoid ambiguity of reading in relation to the index. A digital-drum, indicator located behind the disc displays the ground-pressure datum-setting of the instrument, the indicator being visible via the transparent portion of the disc within a further window in the scale.

REFERENCES:
patent: 2208728 (1940-07-01), Menzer

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