Vinyl to Digital
in [UK Mac]
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From: Graham J on 16 Mar 2010 18:38 "Graeme" <Graeme(a)greywall.demon.co.uk> wrote in message news:9be4fff850%Graeme(a)greywall.demon.co.uk... > In message <1jfgfyi.z2bu74l0j7ofN%peter(a)cara.demon.co.uk> > peter(a)cara.demon.co.uk (Peter Ceresole) wrote: > >> Graeme <Graeme(a)greywall.demon.co.uk> wrote: >> >> > I was told they were eidophores, enormous machines that smoked gently. >> >> Could be, but that could also describe arc lighted 35mm back projection >> machines. >> >> You may well be right- but it would have been odd as the Beeb had plenty >> of projectors, but I think they would have had to hire in Eidophores. > > Knowing the Beeb they could have generically called all BP equipment > Eidophores. My recollection (from working at Phillips in 1970/71 was that they were called "Eidofor". Perhaps that was the Dutch spelling ... -- Graham J
From: Adrian Tuddenham on 16 Mar 2010 19:14 Rowland McDonnell <real-address-in-sig(a)flur.bltigibbet.invalid> wrote: > Peter Ceresole <peter(a)cara.demon.co.uk> wrote: > > [snip] > > > I never consciously saw the colour versions, although the thought of > > aligning a triple-projector setup sounds quite nightmarish. Let alone > > (AAAAAARRRRGH!) a colour disc system... > > <puzzled> > > The great thing about a rotating colour disc to give you time-sequential > colour separation is that there are no beam alignment problems. > > Baird had colour disc mechanical telly working well in the 1920s - > different tech to generate the image-to-project, but the basic same idea > at the colour end: rotating coloured thingy as a reflector to provide > yer different colours for projection. > > I recall reading a Wireless World article on the subject - written at > the time by a chap who'd seen a demo of it in operation. (I thought I > put the article in my filing cabinet, but can I find it? Nope.) > > And it was meant to be a domestic set, so it wasn't hard to set up. > > 600 line colour, 1920s, colour picture comparable with cinema colour. > > That's the joy of projector telly, done properly. And Baird had it > sorted in the 1920s. The Eiodophor had a degree of image lag caused by the surface of the oil film only returning to its original position slowly. You needed very short persistence if you were going to use colour sequential scanning. -- ~ Adrian Tuddenham ~ (Remove the ".invalid"s and add ".co.uk" to reply) www.poppyrecords.co.uk
From: Peter Ceresole on 16 Mar 2010 19:41 T i m <news(a)spaced.me.uk> wrote: > There seems to be loads of things we (still) get wrong re mirrors. > Even when they are to be launched into space it seems? They seem to have learnt that incredibly expensive lesson- Apparently the first segment of the James Webb telescope has gone into test and will become a spare, and they are testing again and again. Problem being that the James Webb will be much too far away to be serviceable in position, so if they get it wrong, they get it wrong for ever, and the JWST is going to cost bazillions. Beryllium mirrors- woo-hoo! <www.irconnect.com/noc/press/pages/news_releases.html?d=182026> Although not as much as bailing out a stupid bank. -- Peter
From: Rowland McDonnell on 16 Mar 2010 20:08 Adrian Tuddenham <adrian(a)poppyrecords.invalid.invalid> wrote: > Rowland McDonnell <real-address-in-sig(a)flur.bltigibbet.invalid> wrote: [snip] > > That's the joy of projector telly, done properly. And Baird had it > > sorted in the 1920s. > > The Eiodophor had a degree of image lag caused by the surface of the oil > film only returning to its original position slowly. You needed very > short persistence if you were going to use colour sequential scanning. Oh aye, but you won't have beam alignment problems as you would with a three beam setup. Other problems, yes; but not that one. Rowland. -- Remove the animal for email address: rowland.mcdonnell(a)dog.physics.org Sorry - the spam got to me http://www.mag-uk.org http://www.bmf.co.uk UK biker? Join MAG and the BMF and stop the Eurocrats banning biking
From: Rowland McDonnell on 16 Mar 2010 23:10
Peter Ceresole <peter(a)cara.demon.co.uk> wrote: [snip] >The only other time I felt something as bad was > much later, during the early '70s, in a weaving mill in Preston with > hundreds of flying shuttles, very ancient and horribly noisy, and no > health and safety rules in sight (or hearing). It was an amazing > experience; the sound was a physical oppression. If I wanted to say > something I'd stand inches away and shout, and they'd shout back, and > basically we were both lip reading. After a while your ears went > comfortably numb and the noise sort of faded. I think everybody working > there was functionally deaf within a week, for the rest of their lives, > and I'm certain they all had very severe tinnitus. My late great-uncle-in-law Fred worked in a Lancashire spinning mill all his working life; first job, re-tying threads that had snapped during the spinning process (without stopping the machinery, of course - get it wrong, the spinning mule crushes you to death). I'm certain that he was neither deaf nor suffering from bad tinnitus in his old age. He loved his Walkman, which he used for listening to Beethoven. And you could converse with him without any of the trouble you get with old people who are deaf. Then again, having met old looms in operation, they're a lot noiser than the spinning machines. A *LOT* noisier... You want to find out yourself, anyone here? Quarry Bank Mill, that's the place to go. Look it up on the Web. Rowland. -- Remove the animal for email address: rowland.mcdonnell(a)dog.physics.org Sorry - the spam got to me http://www.mag-uk.org http://www.bmf.co.uk UK biker? Join MAG and the BMF and stop the Eurocrats banning biking |