GB1109172A - Telescopic direction-finding apparatus - Google Patents

Telescopic direction-finding apparatus

Info

Publication number
GB1109172A
GB1109172A GB688964A GB688964A GB1109172A GB 1109172 A GB1109172 A GB 1109172A GB 688964 A GB688964 A GB 688964A GB 688964 A GB688964 A GB 688964A GB 1109172 A GB1109172 A GB 1109172A
Authority
GB
United Kingdom
Prior art keywords
reflector
telescope
card
compass card
illuminated
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
GB688964A
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.)
EDWARD LOCKER DELMAR-MORGAN
Original Assignee
EDWARD LOCKER DELMAR-MORGAN
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 EDWARD LOCKER DELMAR-MORGAN filed Critical EDWARD LOCKER DELMAR-MORGAN
Priority to GB688964A priority Critical patent/GB1109172A/en
Publication of GB1109172A publication Critical patent/GB1109172A/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
    • G01C17/02—Magnetic compasses
    • G01C17/04—Magnetic compasses with north-seeking magnetic elements, e.g. needles
    • G01C17/10—Comparing observed direction with north indication
    • G01C17/12—Comparing observed direction with north indication by sighting means, e.g. for surveyors' compasses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/16—Housings; Caps; Mountings; Supports, e.g. with counterweight

Abstract

1,109,172. Direction finding. E . L. DELMAR-MORGAN and H.E. BROOKS. May 18, 1965 [Feb.19, 1964], No.6889/64. Heading G1F. Telescopic direction finding apparatus comprises means for projecting an image at infinity of the appropriate part of an illuminated compass card 18 into the objective of the telescope 11 used for viewing distant objects. The telescope 11 is preferably one part of a binocular telescope viewing system, the distant objects being viewed through a transparent reflector 15. Light entering through this reflector 15 illuminates the compass card 18, and by means of a lens 14 and the reflector 15, an image of part of the card is projected on to the focal plane of the telescope. In a modified embodiment an additional reflector is used and the compass card is provided with a depending skirt carrying the markings. The skirt may be translucent and illuminated from within by a small lamp. The reflector 15 may have varying partially reflecting, partially transmitting characteristics or a set of different interchangeable reflectors may be provided.
GB688964A 1964-02-19 1964-02-19 Telescopic direction-finding apparatus Expired GB1109172A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB688964A GB1109172A (en) 1964-02-19 1964-02-19 Telescopic direction-finding apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB688964A GB1109172A (en) 1964-02-19 1964-02-19 Telescopic direction-finding apparatus

Publications (1)

Publication Number Publication Date
GB1109172A true GB1109172A (en) 1968-04-10

Family

ID=9822665

Family Applications (1)

Application Number Title Priority Date Filing Date
GB688964A Expired GB1109172A (en) 1964-02-19 1964-02-19 Telescopic direction-finding apparatus

Country Status (1)

Country Link
GB (1) GB1109172A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0086618A1 (en) * 1982-02-12 1983-08-24 HALL & WATTS LIMITED Improvements relating to compasses
DE3704848A1 (en) * 1986-09-18 1988-03-31 Wild Heerbrugg Ag MODULAR OBSERVER WITH DEVICE
DE8815669U1 (en) * 1988-12-17 1989-03-23 Antzel, Josef-Friedrich, 8901 Adelsried, De

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0086618A1 (en) * 1982-02-12 1983-08-24 HALL & WATTS LIMITED Improvements relating to compasses
DE3704848A1 (en) * 1986-09-18 1988-03-31 Wild Heerbrugg Ag MODULAR OBSERVER WITH DEVICE
DE8815669U1 (en) * 1988-12-17 1989-03-23 Antzel, Josef-Friedrich, 8901 Adelsried, De

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