• Short Summary

    DEMONSTRATED IN LONDON, UK, NOV 7 - AN ULTRA-SONIC BURGLAR AND FIRE ALARM CALLED THE SONALARM, AND CLAIMED BY THE MAKERS TO BE THE WORLD'S FIRST, IT GIVES WARNING OF NEARBY MOVEMENT, SOUND AND HEAT.

  • Description

    DEMONSTRATED IN LONDON, UK, NOV 7 - AN ULTRA-SONIC BURGLAR AND FIRE ALARM CALLED THE SONALARM, AND CLAIMED BY THE MAKERS TO BE THE WORLD'S FIRST, IT GIVES WARNING OF NEARBY MOVEMENT, SOUND AND HEAT.

    THIS NEW BRITISH ELECTRONIC INSTRUMENT IS FULLY TRANSISTORISED AND CONTAINED IN A SMALL CASE. IT EMITS INAUDIBLE SOUND-WAVES WHICH COVER THE WHOLE VOLUME OF A ROOM, AND THE RETURNING ECHOES ARE AGAIN RECEIVED BY THE SONALARM. SHOULD A THIEF DROP THROUGH THE CEILING, BREAK THROUGH A WALL OR EMERGE FROM CONCEALMENT IN A CUPBOARD, THE SOUND WAVES ARE DISTURBED, CAUSING CONTACTS OF AN ELECTRICAL RELAY TO CLOSE. THEN, DEPENDING ON THE TYPE OF SONALARM, A BELL MAY RING, THE ENTIRE LIGHTING SYSTEM OF THE BUILDING MAY BE SWITCHED ON OR A WARNING SENT EITHER TO A CENTRAL CONTROL POST, OR DIRECT TO THE POLICE.

    FIRE WILL ALSO DISTURB THE SOUND WAVES AND THE ALARM WILL SOUND AS EFFECTIVELY AS A BURGLAR. TO ENSURE THAT CATS AND MICE WILL NOT CAUSE FALSE ALARMS, THE INSTRUMENT HAS A SENSITIVITY CONTROL, OPERATING IN A SIMILAR MANNER TO THE VOLUME CONTROL ON A RADIO SET.

  • Tags

  • Data

    Film ID:
    VLVA9QL5U7JARPC1SJ6TZJ3JUD8JD
    Media URN:
    VLVA9QL5U7JARPC1SJ6TZJ3JUD8JD
    Group:
    Reuters - Incuding Visnews
    Archive:
    Reuters
    Issue Date:
    07/11/1961
    Sound:
    Unknown
    HD Format:
    Available on request
    Stock:
    Black & White
    Duration:
    00:01:30:00
    Time in/Out:
    /
    Canister:
    N/A

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