alt Hacker NewsMIL-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.
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