Instrument for sensing magnetic variations in the atmosphere

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Description

FIG. 1 is a perspective view of an instrument for sensing magnetic variations in the atmosphere showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a typical side elevational view thereof; and

FIG. 4 is a bottom plan view thereof.

Referenced Cited
U.S. Patent Documents
D11755 April 1880 Busteed
D16765 July 1886 Brown
D21244 December 1891 Helphenstine
D51942 April 1918 VanRaalte
D82492 November 1930 Foshay
D89609 April 1933 Aldrich
D208422 August 1967 Womack
D238880 February 1976 Elwell
D241294 September 1976 Zimbler
Patent History
Patent number: D254722
Type: Grant
Filed: Nov 21, 1977
Date of Patent: Apr 15, 1980
Assignee: Laurence Enterprises, Inc. (Greenwich, CT)
Inventor: Frances Laurence (Greenwich, CT)
Primary Examiner: Nelson C. Holtje
Law Firm: Bryan & Bollo
Application Number: 5/853,631
Classifications
Current U.S. Class: Radiation, E.g., Geiger Counter (D10/47); D10/109
International Classification: D1004;