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General Vintage Technology Discussions For general discussions about vintage radio and other vintage electronics etc. |
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15th Nov 2018, 6:43 pm | #61 |
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Re: Electronics versus plumbing?
I've seen some old books on electricity where what we now call a 'transformer' (2 or more magnetically-coupled coils) was called a 'static transformer'. Back then the term 'transformer' also covered motor-generator sets.
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15th Nov 2018, 7:11 pm | #62 |
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Re: Electronics versus plumbing?
Later more commonly known as rotary converter.
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15th Nov 2018, 7:50 pm | #63 |
Nonode
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Re: Electronics versus plumbing?
'Rotary Transformer' was a very common term used in aircraft electronic equipment from the valve era (my main area of interest), along with 'rotary convertor', 'motor-generator', or in the US, 'dynamotor'. The picture is of a post-war example.
Andy |
15th Nov 2018, 10:28 pm | #64 | |
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Re: Electronics versus plumbing?
Quote:
In fluidic or gasseous systems, the molecules of fluid or gas can only ever be transported or transport other matter within them, from a zone of higher to a zone of lower pressure. This is why a vacuum value can never exceed the value of atmospheric pressure, but a pressure value can increase without bounds. A vacuum is merely the absence of an amount of positive pressure with respect to atmospheric pressure or some higher positive pressure value. So nobody has in fact been sucked out of a plane, they were pushed out by the escaping air. Likewise, if you were in a spacecraft and it vented to space through a large hole, there would only be forces trying to push you out the hole, while the air was leaving. If you could hang on long enough and let all the air go, the forces trying to push you out the hole would drop to zero. The "vacuum of space" cannot pull on you. They did this pretty well in 2001 Space Odyssey in the air lock scene. Last edited by Argus25; 15th Nov 2018 at 10:35 pm. |
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15th Nov 2018, 10:40 pm | #65 |
Nonode
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Re: Electronics versus plumbing?
David, you refer probably to a Blakes Type B hydram, the type A pumps clean stream water, the type B separate clean water. I have a copy of Blakes' (of Accrington) Hydram Catalogue in front of me now. Plus loads of stuff from the Montgolfiers onwards.
I would have loved to take it off your hands, but maybe no longer here and now. Les. |
15th Nov 2018, 10:41 pm | #66 |
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Re: Electronics versus plumbing?
Here's John Scott-Taggart's Mechanical-Hydraulic analogies of the operations of thermionic Diode and Triode valves (from "The Manual of Modern Radio", 1933).
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15th Nov 2018, 11:03 pm | #67 |
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Re: Electronics versus plumbing?
Yes, Les. It's quite a big beastie, in the pit of an old water mill set in concrete and covered in water (spring not river. It has two incerted mushroom valves (with lots of bracing webs looking like mushroom gills) There's a large accumulator and a cylinder which must contain a free piston separating clean and river water. In the building there were spare gaskets etc hung all over the place. It must have been a maintenance nightmare. A tree trunk had been hefted into place across the building for block and tackle for lifting the top parts off.
In the sixties a couple of Stewart Turner screw-in-rubber-sleeve pumps were put in place, drawing from an added tank. Twenty years ago I built a new pump house up in the stable yard with a 1000 litre new feed tank in the 6" pipe from the spring. A little Italian turbine pump does the job with a float valve in the new 8000 litre tank up the hill. The Stewart Turners had just been on a timer! and spent mosst of the time with the old top tank overflowing. The Hydram will take a lot of getting out. The mill leat and race need rebuilding before I could run a new wheel, or maybe a Banki or a small screw? Ah, dreams! Be nice to work the Mills on the air QSO party on water mill power. David
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16th Nov 2018, 3:26 am | #68 |
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Re: Electronics versus plumbing?
I wish my electronics lecturer, when we studied magnetic recording, had explained the hysteresis-loop B-H curve in terms of mechanical backlash.
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16th Nov 2018, 8:03 pm | #69 |
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Re: Electronics versus plumbing?
Slightly off course, but it adds to the conversation. When studying CCDs for the first time way back it was normal to talk about the size of elements (pixels) in terms of jugs or buckets to be filled by Photons “ like buckets of water” and how they could overflow into the next element, “ like a bucket overflowing with water”.
Simple, but it was understood. Cheers John |
16th Nov 2018, 8:25 pm | #70 |
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Re: Electronics versus plumbing?
At which point I should remind everyone of the "bucket-brigade device" - https://en.wikipedia.org/wiki/Bucket-brigade_device - which was a sort-of serial analog memory/delay-line.
And the overflowing-bucket/funnel analogy is familiar to us ISP-types when used to explain queue-management policies in 'oversubscribed' Internet-infrastructure: https://www.cisco.com/c/en/us/td/doc.../qcfpolsh.html This is why your "50Megabit" Internet connection struggles to get a couple of Megabits of throughput when everyone on your street is downloading the latest Game of Thrones episode. |
16th Nov 2018, 9:58 pm | #71 |
Nonode
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Re: Electronics versus plumbing?
Where I live now, there is a derelict mill wheel directly opposite. When I lived in Staffs, my cottage was on a mill site, but the wheel etc was removed in the late 40's. 100 yards upstream, there were two wheels, side by side. They were used commercially until 1966. Two more former sites in the half mile up the hill, then the flatter area with sandstone on clay whence the water rose. It was here where the ram pumps were in use. In the two mile stretch below my cottage were 5 more mills/sites when the stream ran into the Trent.
I started my working life in the pottery industry, which had relied on water power for materials grinding in previous decades, though some of the local mills could be traced back to the Doomesday book. I have loads of relating info. Les. |
17th Nov 2018, 12:44 am | #72 |
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Re: Electronics versus plumbing?
Network engineers talk about their backhaul infrastructure etc in terms of "pipes".
Satellite transponders are called "bent pipes". LC tuned circuits are sometimes called tank circuits. Inductors are called chokes and ballasts.
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17th Nov 2018, 4:20 am | #73 | ||
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Re: Electronics versus plumbing?
Quote:
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17th Nov 2018, 6:48 am | #74 |
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Re: Electronics versus plumbing?
An analogy of the hydraulic pump/motor for DC would be a DC motor driving a DC generator.
Once a common thing David
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17th Nov 2018, 6:34 pm | #75 | |
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Re: Electronics versus plumbing?
Quote:
Electrically, there can be 'suction' of course. Pull some electrons out of one end of a wire and you leave an overall positive charge - which actively attracts replacement electrons from somewhere. It's where the plumbing / electronics parallel ceases to be parallel. Another example where analogy fails is when a water pipe ends in a nozzle - water flows out in a coherent stream (or if greater than a critical flow, a turbulent stream) whereas electrons ejected from an electron gun de-focus by themselves, due to mutual repulsion. |
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