GB217267A - Improvements in and relating to wireless telegraph receiving apparatus - Google Patents

Improvements in and relating to wireless telegraph receiving apparatus

Info

Publication number
GB217267A
GB217267A GB355823A GB355823A GB217267A GB 217267 A GB217267 A GB 217267A GB 355823 A GB355823 A GB 355823A GB 355823 A GB355823 A GB 355823A GB 217267 A GB217267 A GB 217267A
Authority
GB
United Kingdom
Prior art keywords
inductance
plate
stem
former
cover
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
GB355823A
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.)
GEORGE LOUIS WARD
THOMAS NOAH COLE
Original Assignee
GEORGE LOUIS WARD
THOMAS NOAH COLE
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 GEORGE LOUIS WARD, THOMAS NOAH COLE filed Critical GEORGE LOUIS WARD
Priority to GB355823A priority Critical patent/GB217267A/en
Publication of GB217267A publication Critical patent/GB217267A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F21/00—Variable inductances or transformers of the signal type
    • H01F21/12—Variable inductances or transformers of the signal type discontinuously variable, e.g. tapped

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

217,267. Richardson, R. P., Cole, T. N., and Ward, G. L. Feb. 6,1923. Regulating Switches.-The contact-plates of a regulating switch are mounted on the base on which an inductance is wound and the controlling stem is mounted centrally in the base; the device is secured to the cover-plate of a wireless receiving set by means requiring only one perforation in the cover-plate. In the apparatus shown in Fig. 1, the inductance comprises a coil 1 wound on an insulating former 2 closed at one end by a plate 3 and at the other by a plate 4 carrying contact studs 5 connected to tappings on the coil. A switch arm 10 mounted on a. central stem 7 which passes through a threaded bush 11 screwed into the plate 3. The inductance may be mounted on the cover-plate of a wireless receiving set by passing the bush 11 through a perforation therein and securing it together with a graduated disc 12 by a nut. A knob 8 and pointer 9 are mounted on the spindle 7. In a modification the 'former 2 is grooved to receive the wire, and the bush 11 and its nut are replaced by a flanged bush which is inserted through the hole in the cover-plate and screwed to the former. A variable inductance of the above kind may be provided with means for varying its coupling with a second inductance of fixed value mounted on the same base, as shown in Fig. 4. A multi-layer coil 24 has tappings connected to contact studs 25 on an insulating plate 26, the studs being engaged by a switch arm 27 mounted on a hollow stem 28. The second inductance 35 is mounted on a former 34 having a threaded central aperture engaging a threaded rod 33 secured to a stem 31 passing through the stem 28. The former 34 is prevented from rotating by guides 36. The unit is secured to the cover-plate of the set by a ranged and threaded bush 21. A knob 29 and pointer 30 are secured to the stem 28, and a knob 32 to the stem 31. In a modification, a tapped cylindrical inductance is caused to slide over a cylindrical inductance of fixed value by axial motion of the switch arm stem. Pins on the sliding inductance engage holes in the fixed one to prevent rotation.
GB355823A 1923-02-06 1923-02-06 Improvements in and relating to wireless telegraph receiving apparatus Expired GB217267A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB355823A GB217267A (en) 1923-02-06 1923-02-06 Improvements in and relating to wireless telegraph receiving apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB355823A GB217267A (en) 1923-02-06 1923-02-06 Improvements in and relating to wireless telegraph receiving apparatus

Publications (1)

Publication Number Publication Date
GB217267A true GB217267A (en) 1924-06-06

Family

ID=9760602

Family Applications (1)

Application Number Title Priority Date Filing Date
GB355823A Expired GB217267A (en) 1923-02-06 1923-02-06 Improvements in and relating to wireless telegraph receiving apparatus

Country Status (1)

Country Link
GB (1) GB217267A (en)

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