Building a damp sensor out of two tacks in a clothespin held open by an aspirin tablet works.
In a saucer, soggy aspirin conducts excellently well, making this more rapidly sensitive than almost-but-not-quite-touching contacts. (Next toy, just because it's more elegant: instead of a storebought battery, retro stacks of copper & zinc, separated by dry paper. I wonder if atmospheric dampness will get false alarms out of that one.)
The low-contrast graph-paper background of Mim's little "Notebooks" is unhelpful, I find, though the neat handwritten layout is charming and clear.
Radio Shack Cat. No. 62-5026
(No ISBN at all! though Mims has written more conventionally catalogued books.)
So wrote clew in Technology. | TrackBack