Re: [ATM] Interesting New Commercial Telescope Design

[dave w <daze39@earthlink.net>]

Thomas Janstrom wrote:

> Yes, there is a picture of it in the last chapter of my copy Tex, IIRC (my
> copy is in a box still in storage) the chapter is called "Interesting
> Telescopes"; it was that picture that inspired me to start building
> Cassergainian telescopes in the first place!


Yep, I've seen that picture (I think it's the last one in the "Interesting Telescopes"
appendix): the device was referred to as a "Dall Pocket Telescope" - same general layout
as the "Lazzaroti Gladius", but about a 3 or 4 inch diameter primary - the secondary was
on a single-strut mount instead of the tubular support used on the "Gladius" (nice touch,
that...) and there was a vertical handle (with what looked like a bicycle hand-grip) on
the bottom of the structure rail.

This "Gladius" looks like a clever concept - but the prices - $6.7k for a 10"
and $8k for a 12.5" ("please inquire" about the 16") - seem a bit on the high
side...

-dave w


> 
> Thomas.
> 
> -----Original Message-----
> From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
> Mitchell R
> Sent: Friday, 16 November 2007 8:32 AM
> To: atm@atmlist.net
> Subject: Re: [ATM] Interesting New Commercial Telescope Design
> 
> 
> Didn't Horace Dall himself make a pocket Cass with a
> single pole, like that one?  I seem to remember
> something in ATM and SciAm about that. 
> 
> Ross 
> 
> 
> *Yup, I can't cite the exact source but bumbling through my ATM books I
> recall what you're talking about. Quite a cute little terrestrial scope.
> Good for lunar astronomy if u get something to stabilize it with.
> 
> Mitch
> 
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