Hacker Newsnew | past | comments | ask | show | jobs | submitlogin

MIL-P-1629 from 1949 formally defines fail-open mechanical switches that release pressure on failure.

The concept goes back to a pressure cooker invented in 1679 by Papin.



contextual, as are air brakes 'failing closed'. However, I wonder how fast Papin made his spagbol with his pressure cooker




Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact

Search: