GB225517A - Improvements relating to electric inductance coils for locating metals which are being carried away - Google Patents

Improvements relating to electric inductance coils for locating metals which are being carried away

Info

Publication number
GB225517A
GB225517A GB22130/24A GB2213024A GB225517A GB 225517 A GB225517 A GB 225517A GB 22130/24 A GB22130/24 A GB 22130/24A GB 2213024 A GB2213024 A GB 2213024A GB 225517 A GB225517 A GB 225517A
Authority
GB
United Kingdom
Prior art keywords
turns
frame
locating
metals
carried away
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
GB22130/24A
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.)
RUDOLF HERMANN HEINRICH GEFFCK
WETZEL GEB
Original Assignee
RUDOLF HERMANN HEINRICH GEFFCK
WETZEL GEB
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 RUDOLF HERMANN HEINRICH GEFFCK, WETZEL GEB filed Critical RUDOLF HERMANN HEINRICH GEFFCK
Publication of GB225517A publication Critical patent/GB225517A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils

Abstract

225,517. Geffcken, R. H. H., Richter, R. H., and Wetzel, Geb. Nov. 26, 1923, [Convention date]. Theft and like alarms. -An inductance coil for apparatus for locating metals which are being carried away by persons leaving factories &c. consists of not more than twenty turns 2 mounted rigidly on a frame 1 which is protected from vibrations so as to reduce variations in capacity. The turns 2 may be supported or tensioned by transverse rods 3 at intervals of about 25 cm. The tensioning may be effected by wires secured to the inner or outer surface of the frame 1. Alternatively the turns may be stiffened along their whole length, for example by placing the turns along their whole length on a wooden frame or other support or by embedding them in. asphalt, or by covering the turns with armouring or cotton, or by making the cross-section of the conductor large or of T-shaped section. In the case where the coil is in the form of a door frame through which persons are required to pass, a footboard may be placed through the frame and separated mechanically therefrom, lateral protecting flanges being provided.
GB22130/24A 1923-11-26 1924-09-19 Improvements relating to electric inductance coils for locating metals which are being carried away Expired GB225517A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE225517X 1923-11-26
DEG60210D DE401260C (en) 1923-11-26 1923-11-27 Field-generating induction coil for personal control devices for the detection of metals carried

Publications (1)

Publication Number Publication Date
GB225517A true GB225517A (en) 1925-06-18

Family

ID=75293632

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22130/24A Expired GB225517A (en) 1923-11-26 1924-09-19 Improvements relating to electric inductance coils for locating metals which are being carried away

Country Status (2)

Country Link
DE (1) DE401260C (en)
GB (1) GB225517A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2154350A (en) * 1984-02-17 1985-09-04 Standard Telephones Cables Ltd Preventing misuse of information stored on computer tapes and the like
GB2525947A (en) * 2014-10-31 2015-11-11 Imagination Tech Ltd Automatic tuning of a gain controller

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2538915B1 (en) * 1983-01-03 1985-10-25 Bernard Jacques DEVICE AND METHOD FOR DETECTION OF METAL OBJECTS SUCH AS FIREARMS, AND LOCAL ACCESS SAS TO PROTECT AGAINST AGGRESSIONS

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2154350A (en) * 1984-02-17 1985-09-04 Standard Telephones Cables Ltd Preventing misuse of information stored on computer tapes and the like
GB2525947A (en) * 2014-10-31 2015-11-11 Imagination Tech Ltd Automatic tuning of a gain controller
GB2525947B (en) * 2014-10-31 2016-06-22 Imagination Tech Ltd Automatic tuning of a gain controller

Also Published As

Publication number Publication date
DE401260C (en) 1924-08-29

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