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"Off" indicates an open circuit for household applicances, lights, etc. Maybe the original fire alarms normally had closed circuits, and began to sing when their circuit was opened
Good point. I don't know if it's the same for everyone, but in my house there are little magnets on the tops of the doors and windows which make the alarm sound if they are separated from their mates in the door/window frames, thus 'opening' the magnetic circuit [not-a-very-good-grasp-of-physics-e]
Entire Thread Subject Posted By Posted Alarms Bean 04/30/01 11:03 AM Re: Alarms wwh 04/30/01 12:58 PM Re: Alarms Geoff 04/30/01 01:07 PM Re: Alarms Jackie 04/30/01 01:22 PM Re: Alarms Bean 04/30/01 02:29 PM Re: Alarms Anonymous 04/30/01 02:37 PM Re: Alarms rodward 04/30/01 03:08 PM Re: Alarms of troy 04/30/01 03:18 PM Re: Alarms rodward 04/30/01 03:37 PM Re: Alarms Hyla 04/30/01 03:19 PM Re: Alarms rodward 04/30/01 03:30 PM Re: Alarms wwh 04/30/01 07:38 PM Re: Alarms wow 05/01/01 07:16 PM Re: Alarms Anonymous 05/01/01 07:44 PM Re: Cop talk wow 05/01/01 08:13 PM Re: Cop talk Sparteye 05/02/01 02:25 PM Re: Cop talk Bobyoungbalt 05/02/01 03:56 PM Re: The Adventure of Charles Augustus Milverton Faldage 05/02/01 04:17 PM Re: Cop talk Bingley 05/03/01 06:49 AM Re: Cop talk Flatlander 05/03/01 05:19 PM Re: Cop talk Bingley 05/07/01 12:09 PM Re: Cop talk of troy 05/07/01 02:32 PM Re: Cop talk wwh 05/07/01 03:49 PM Re: Cop talk Max Quordlepleen 05/07/01 07:02 PM Re: Cop talk of troy 05/07/01 07:29 PM Re: Cop talk Max Quordlepleen 05/07/01 11:58 PM Re: Cop talk rodward 05/08/01 08:57 AM Re: Cop talk Bingley 05/08/01 10:29 AM Re: Cop talk Max Quordlepleen 05/08/01 07:54 PM Re: Cop talk Capital Kiwi 05/09/01 09:32 AM Re: Alarms AnnaStrophic 05/03/01 09:16 PM Burgling Bean 04/30/01 05:26 PM Re: Alarms wwh 04/30/01 03:34 PM Re: Alarms Anonymous 04/30/01 03:38 PM Re: Alarms Geoff 05/08/01 12:16 PM Re: Alarms wsieber 05/07/01 02:14 PM Re: Alarms Bean 05/07/01 05:42 PM Re: Alarms : Off and On wow 04/30/01 01:36 PM Re: Alarms belMarduk 04/30/01 07:10 PM
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