3 ms·
> These mines were set off when a three-note chord was played on the frequency the radio was tuned to, causing three tuning forks (of which each mine had a uniq
by tryauuum 6y ago
> These mines were set off when a three-note chord was played on the frequency the radio was tuned to, causing three tuning forks (of which each mine had a unique combination) to vibrate at once.
so, ehm, what was the soviets' plan? to blow them all at once when the city would be taken by finns?
russian wikipedia page says the plan was to blow them periodically. But it doesn't make much sense, how would the soviets control which mines to blow? hard to imagine they would be aiming radio signal somehow
- tgsovlerkhgsel 6y agoEach mine could be set to a different combination of three trigger frequencies. There weren't many of them in place (I'll write another top-level comment about this - edit: https://news.ycombinator.com/item?id=23089418 https://news.ycombinator.com/item?id=23089418).
- kmill 6y agoAdding to that, even just six frequencies to choose from would let you have twenty distinct targets. (Six choose three.)