Re: ATM Experience in solar filter for amateurs

[Chris Westland <westland@uxmail.ust.hk>]

Kevin Ferguson wrote:
> 
> At 09:19 AM 10/1/96 -0700, Rik Hill wrote:
> > There were Herschel wedges
> >available back in those days (1960's) and they worked well too. I did
> >not mention them because, to my knowledge, they are no longer
> >available.
> 
> Edmund lists #E30,265   Unmounted Herschel wedge prism 40 x 55 mm. $43.85
> 
> ciao, KF

Incredible ... almost all of the books put out today warn about using a
Herschel wedge.  I will have to take a look at the catalog (though
Edmund may include it just to be comprehensive in scope)

Cheers

-c