07-30-2021, 06:14 PM
07-30-2021, 11:50 PM
I'm still amazed by OG telephones. Coast-to-coast voice communication in the age of horse and buggy, 20 years before the first electronic device was invented.
The signaling system alone is an amazing achievement for the 19th century. Rapidly disconnecting and reconnecting the circuit to send the digits in the phone number. Sending 20Hz 90V AC electrical current to ring the bell. Using spinning electrical generators to send the call progress tones (dial tone, busy signal, ringing, etc.)
The signaling system alone is an amazing achievement for the 19th century. Rapidly disconnecting and reconnecting the circuit to send the digits in the phone number. Sending 20Hz 90V AC electrical current to ring the bell. Using spinning electrical generators to send the call progress tones (dial tone, busy signal, ringing, etc.)
07-31-2021, 12:00 AM
07-31-2021, 12:21 AM
This is my favorite can opener:
https://en.wikipedia.org/wiki/P-38_can_opener
A few years ago, my roommate at the time threw mine away, thinking it was a useless piece of scrap metal.
He was an Air Force veteran, and should've known better.
https://en.wikipedia.org/wiki/P-38_can_opener
A few years ago, my roommate at the time threw mine away, thinking it was a useless piece of scrap metal.
He was an Air Force veteran, and should've known better.
07-31-2021, 12:25 AM
That's such a dude can opener.
I've known other dudes who use those can openers.
Even I would have known what that shit was!
I've known other dudes who use those can openers.
Even I would have known what that shit was!
07-31-2021, 12:27 AM
I mean it's kind of obvious it was designed as a cutting tool of some sort. Not just a random piece of metal.