GB191108044A - An Improved Electric Alarm Signal. - Google Patents

An Improved Electric Alarm Signal.

Info

Publication number
GB191108044A
GB191108044A GB191108044DA GB191108044A GB 191108044 A GB191108044 A GB 191108044A GB 191108044D A GB191108044D A GB 191108044DA GB 191108044 A GB191108044 A GB 191108044A
Authority
GB
United Kingdom
Prior art keywords
push
alarm signal
speaking
alternating
improved electric
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
Inventor
Ernest Edward Rogers
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
Application granted granted Critical
Publication of GB191108044A publication Critical patent/GB191108044A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
    • G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Audible And Visible Signals (AREA)

Abstract

8044. Rogers, E. E. March 30. Speaking-tubes. - Apparatus for signalling electrically from end to end of a speaking-tube, and for other purposes, comprises an alternating-current buzzer, a drop indicator, and a contact push, arranged in a watertight box, two or more of these sets being connected by three-wire cables fed from an alternating- current supply board t, as shown in Fig. 4. When reply signals are not required, a twowire connexion may be used, the push being omitted at one station and the audible and visible signals at the other. The magnet A, Fig. 1, vibrates a buzzing armature d carrying a catch e for releasing an indicator g, which drops into view in a window of the casing. The contact push is shown at l and a resetting- push at i.
GB191108044D 1911-03-30 1911-03-30 An Improved Electric Alarm Signal. Expired GB191108044A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191108044T 1911-03-30

Publications (1)

Publication Number Publication Date
GB191108044A true GB191108044A (en) 1911-10-12

Family

ID=32498327

Family Applications (1)

Application Number Title Priority Date Filing Date
GB191108044D Expired GB191108044A (en) 1911-03-30 1911-03-30 An Improved Electric Alarm Signal.

Country Status (1)

Country Link
GB (1) GB191108044A (en)

Similar Documents

Publication Publication Date Title
GB191108044A (en) An Improved Electric Alarm Signal.
US1059759A (en) Electric alarm for locks.
US1148348A (en) Electric horn.
GB190626524A (en) Improvements in or connected with Time-alarm Electric Signalling.
US1115349A (en) Signal system.
US1629236A (en) Means for indicating loss of synchronism in transmission systems
US518971A (en) Electric time-alarm
US837674A (en) Electric signal.
GB191319205A (en) A New or Improved Method of Electrically Operating Railway Signals.
US1683274A (en) Electrical police signal
GB191423170A (en) Electric Sound for Detecting Presence of Metallic Bodies in Living Animal Tissues.
GB191022642A (en) Improvements in Fire Brigade and like Electric Alarms.
GB191304256A (en) Electrical Signalling Apparatus for Lifts and the like.
GB189702581A (en) Improvements in or relating to Alarm Clocks.
GB189818024A (en) Improvements in or relating to Electric Time Alarms or Call-boards and the like.
GB190719870A (en) Improvements in or relating to Burglar and Fire Alarms
GB191115804A (en) An Improved Electric Time-alarm.
GB190605837A (en) Improvements in connection with Burglar Alarms
GB548273A (en) Improvements in sound reproducing and receiving devices
GB190803539A (en) Improvements in Time Alarm Signalling Systems.
GB190601151A (en) Improvements in and connected with Battery Testing Apparatus in Pocket Size.
FR460930A (en) Electrical alarm signal
GB191224960A (en) Improvements in or connected with Apparatus for Periodically Testing Electric Currents.
GB191517000A (en) Improvements in or relating to Audible Signal Devices.
TH13407EX (en) A TRANSMISSION SYSTEM Transmission system.