Measuring instrument

Details Measuring instrument Measuring instrument

1979-10-30

1981-06-02

Haroian, Harry N.

Geometrical instruments

Area integrators

Electrical

33149B, 33192, B43L 908

Patent

active

042702739

ABSTRACT:
A measuring instrument, preferably for determining the mean arterial blood pressure from a graph containing values of systolic pressure and diastolic pressure. The instrument comprises a compass having a pair of outer legs and a single intermediate leg disposed therebetween. The outer legs are arranged to enable the distance between outer ends thereof to be manually varied. A proportioning mechanism maintains an outer end of the intermediate leg at a constant ratio, preferably one-third, of the distance between the outer legs.

REFERENCES:
patent: 61926 (1867-02-01), Copeland
patent: 723720 (1903-03-01), Ostlund
patent: 1201342 (1916-10-01), Peck
patent: 1303471 (1919-05-01), Gross
patent: 1710414 (1929-04-01), Falletta
patent: 2770046 (1956-11-01), Wichmann
patent: 3214835 (1965-11-01), Barquero
patent: 4030486 (1977-06-01), Eastman
American Practical Navigator, N. Bowdetch, U.S. Govt. Printing Office, H.O. Pub. #9, pp. 845-847.

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