3 ms·
I like the idea of the pneumatic whistle. A pressure vessel with a sprung loaded valve held closed by a solenoid, maybe? However it works, it's a really neat pi
by david-given 11y ago
I like the idea of the pneumatic whistle. A pressure vessel with a sprung loaded valve held closed by a solenoid, maybe? However it works, it's a really neat piece of lateral thinking.
- ux-app 11y agoa kind of "dead man's whistle" is guess?