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Old 06-14-2012, 05:34 PM   #11
Bob.Kerns
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Indeed. My room was next to the closet that held them. If I paid attention, I could tell you who was calling whom.
If you break down that sound clip into four parts, the second, the Brrrt where it finds the final available switch for connecting to the final subscriber (based on the last two digits) is something we didn't have, as we had only two-digit extensions.

But the line finders made a similar noise as they scanned across to find the particular open trunk. Each one could respond to any of 200 lines (10 up, 10 across, and each position had a top/bottom pair of possible lines). In our system, they were connected directly to the final switch that accepted two digits.

We had some of the intermediate ones around, but not in use.
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Obviously, we can't have infinite voltage, or the universe would tear itself to shreds, and we wouldn't be discussing Segways.
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Old 06-22-2012, 07:57 PM   #12
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Whose idea was it to to make it look like I started a nonsensical thread?
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Old 06-24-2012, 10:09 PM   #13
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Back in the early 80's (and beyond) I worked for a company called Monroe Systems, and they were a calculator company from so far back, that Mr. Monroe had some of the first patents on calculating machines. (His partner, Mr. Royal, and he were among those to build the first keyboards, but split up after they returned from WW1)

I saw, and tinkered with, a memory calculator from the 50's I believe, that had digital memory. Right now, that does not sound so spectacular, but this was digital memory from the mechanical age...

There were memory spools, shafts with I believe 1400 disks on them, each with only one notch. Notch up = 1, notch anywhere else = 0. Thin copper sensors on each disk, looking like fine combs.

Very interesting machine, even though it likely had no Strowger switches, rheostats, or nixie tubes. (It may have had them, but all I recall in my current brain were the memory spools.)
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Old 08-10-2012, 12:09 PM   #14
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I was waiting for the specific Nixie tube reference!
kinda surprised the Russians aren't making Nixie tubes, they are really popular for clocks and the like. I have an old instrument with Nixie tubes, I might make an exception to my "no new projects" rule and make a clock.
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Old 09-15-2012, 06:50 PM   #15
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If any old timers want to see old telephones ..

Visit Sydney !

No not Sydney, Australia, but Sydney, Nova Scotia.
Bell lived a big part of his life in the Maritimes.
There is a Bell museum, about an hour out of Sydney and you can see some of his original work.
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