Comments on: German Telescope is UNIQUE in Design

By: MrG

MrG — Thu, 05 Mar 2009 12:43:56 +0000

You might be right, Toronto, I forgot about that — you have a composite lens with multiple layers made of glasses with different indexes of refraction that cancel out color dispersion. But a lens almost half as thick as it is wide still seems a bit excessive. That’s a lot of very-high-quality glass. MrG / http://www.vectorsite.net/gblog.html

By: Toronto

Toronto — Thu, 05 Mar 2009 03:35:24 +0000

Stan/MrG: wouldn’t a refractor of that vintage have achromatic elements that might cause it to be a stack of glass 30cm or so thick? (And a telescope of that huge magnification surely ought to be color corrected.)

Thanks for the link, G. That’s a neat story.

By: StanFlouride

StanFlouride — Thu, 05 Mar 2009 01:50:43 +0000

MrG-
Unfortunately the link does not reveal the thickness of the lens but its diameter is 68 cm, about 28″. I sent them an email asking about the lens thickness and will post the results when the respond.

By: MrG

MrG — Wed, 04 Mar 2009 21:53:37 +0000

The objective lens was 28 inches in diameter and … 12 INCHES THICK?! Ahhhhhhh … I suspect not.
I bet someone mixed up 3 centimeters (bit over an inch) with 30 centimeters (a foot). Cheers — MrG / http://www.vectorsite.net/gblog.html

By: Jeff

Jeff — Wed, 04 Mar 2009 19:01:37 +0000

The “new” telescope was built in 1896?!

It often strikes me how badly these old articles address the fundamental questions I was taught in 5th grade – who, what, where, when, why and how?

Often their are no names, no location, no dates.
For example: Battery-Operated Hearing Aid Is Easily Concealed.

By: Torgo

Torgo — Wed, 04 Mar 2009 05:08:59 +0000

Thanks for the link, Wormhole. Very interesting.

You saved me from making a joke about being able to shell Paris and study the damage at the same time.

By: wormhole

wormhole — Wed, 04 Mar 2009 05:03:18 +0000

A “”NEW”" departure! that telescope went up in 1896 and amazingly its still there in working order.
http://www.sdtb.de/The-large-telescope.517.0.html
Keep up the good work i learn something every time i visit here.

wormhole