GB550314A - Improvements in magnetic compasses - Google Patents

Improvements in magnetic compasses

Info

Publication number
GB550314A
GB550314A GB541542A GB541542A GB550314A GB 550314 A GB550314 A GB 550314A GB 541542 A GB541542 A GB 541542A GB 541542 A GB541542 A GB 541542A GB 550314 A GB550314 A GB 550314A
Authority
GB
United Kingdom
Prior art keywords
indentations
tubes
air
magnetic
magnetic compasses
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB541542A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB541542A priority Critical patent/GB550314A/en
Publication of GB550314A publication Critical patent/GB550314A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C17/00—Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes

Abstract

550,314. Magnetic compasses. JONSSON, A. April 22, 1942, No. 5415. [Class 97 (ii)] The liquid-filled box of a magnetic compass is formed internally with thin-walled indentations 18, Fig. 3, open to the air, or with tubes 17, Fig. 2, of celluloid or other suitable material filled with air or other gas so as to yield under pressure variations due to temperature changes, the indentations or tubes having longitudinal edges arranged parallel to the north-south line. The indentations or tubes are arranged on either side of the compass needle so as to serve as stops.
GB541542A 1942-04-22 1942-04-22 Improvements in magnetic compasses Expired GB550314A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB541542A GB550314A (en) 1942-04-22 1942-04-22 Improvements in magnetic compasses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB541542A GB550314A (en) 1942-04-22 1942-04-22 Improvements in magnetic compasses

Publications (1)

Publication Number Publication Date
GB550314A true GB550314A (en) 1943-01-01

Family

ID=9795747

Family Applications (1)

Application Number Title Priority Date Filing Date
GB541542A Expired GB550314A (en) 1942-04-22 1942-04-22 Improvements in magnetic compasses

Country Status (1)

Country Link
GB (1) GB550314A (en)

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