Big Al Posted March 22, 2013 Share Posted March 22, 2013 Interesting. http://www.retronaut.com/2013/03/the-great-paris-exposition-telescope/ Link to comment Share on other sites More sharing options...
Guest Steve Posted March 22, 2013 Share Posted March 22, 2013 (edited) Errrm - wouldn't it have maybe done better if it had pointed upwards a little Edited March 22, 2013 by Steve Link to comment Share on other sites More sharing options...
Guest Kheldar Posted March 22, 2013 Share Posted March 22, 2013 Errrm - wouldn't it have maybe done better if it had pointed upwards a little Isn't that a mirror (at a diagonal) on the fourth image down? Link to comment Share on other sites More sharing options...
BAZ Posted March 23, 2013 Share Posted March 23, 2013 It looks like it just projects an image, and the mirror is used to acquire the object, and project it down the tube onto a screen. Link to comment Share on other sites More sharing options...
Tweedledee Posted March 23, 2013 Share Posted March 23, 2013 Cheers Alan. There's some amazing stuff on that website. Never seen that one before, but it's on my favourites now, thanks. Link to comment Share on other sites More sharing options...
Big Al Posted March 23, 2013 Author Share Posted March 23, 2013 Have been a big fan of the Retronaut site for a cople of years. It really can be a thief of time, though. If you like history and photography, also try shorpy.com. Link to comment Share on other sites More sharing options...
Brantuk Posted March 23, 2013 Share Posted March 23, 2013 Curious design - wonder if it would work today based on digital technology and correcting mirror arrays. Here's a bit more about it: http://en.wikipedia.org/wiki/Great_Paris_Exhibition_Telescope_of_1900 Link to comment Share on other sites More sharing options...
Tweedledee Posted March 23, 2013 Share Posted March 23, 2013 Have been a big fan of the Retronaut site for a cople of years. It really can be a thief of time, though. If you like history and photography, also try shorpy.com. You are right, I've just spent a thoroughly enjoyable 2 hours on that site. If anybody reads Clive Cussler novels, you'll find some unusual old vehicles on this site that feature in his books, like the snow cruiser and ironclads. Fascinating stuff. The shorpy site is also interesting, thanks. Curious design - wonder if it would work today based on digital technology and correcting mirror arrays. Here's a bit more about it: http://en.wikipedia.org/wiki/Great_Paris_Exhibition_Telescope_of_1900 Very interesting. It is about F46. No wonder it was difficult to aim with a 3 arc minute field of view. I'm sure digital technology could sort that out. I'd like to find more details about the projection eyepiece. Looks like the projection screen must be about 15 metres across. With the image spread out to that size I would imagine the view would be pretty dim. Link to comment Share on other sites More sharing options...
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