Power Failure Alarm.
When your A.C. lines go dead, usually there are obvious indicators: Your lights go off, the T.V. picture disappears, or whatever you are using at the time stops running.
But there are times when you might not know. A blown fuse or tripped circuit breaker can disrupt power in part of your house. You open the freezer and find everything thawed out. Also, a power failure alarm can alert you while you are asleep that you just experienced a failure so you can make plans or correct things.
Two pages ( 2 sheets - front on each sheet ) B & W photos, illustrations, expanded view, parts list and instructional narrative.
My plans are from original source materials such as books, magazines and other publications and the pages are carefully removed.