Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION.
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The entries are in alphabetical order by magazine name and then in chronological sequence.
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Intrusion (splash or wave) detector for backyard pools. Sounds a shrill alarm if water is disturbed. Est. cost: $12.
ELECTRONICS ILLUSTRATED Sep 1970 (v.13#5) pg. 32

Swimming pool splash alarm rings whenever water is disturbed. Continues to ring until shut off.
POPULAR ELECTRONICS [1] Jul 1966 (v.25#1) pg. 48

Swimming pool splash alarm uses only one transistor.
POPULAR ELECTRONICS [1] Jan 1972 (v.1#1) pg. 102

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