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Old 9th Feb 2018, 5:00 pm   #4
Bookman
Hexode
 
Join Date: Aug 2017
Location: Taunton, Somerset, UK.
Posts: 318
Default Re: How were annunciator panels signwritten?

If you were to walk into an old power station control room and then into their corresponding protection and control substations you would see how vast and complex annunciation was and still is. Its not just the need to announce to others what an item is and its indication of relevant status in time but also its possible diagrammatic link to other similar components.
Most items with the exception of electrically operated semaphores and indication lights had hand or type written miniature cards that dropped into an appropriate receptacle. For example, if a circuit breaker tripped there could be countless reasons why and it was the flag associated with the corresponding device that alerted the engineer to a catastrophic incident or otherwise.
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