Rashad Al-Mansour wrote:
> Hey Bob,
>
> 24 is it! My second question may have been worded
> incorrectly. What was the mirror made of?
Just a guess, based on the material used by Lord Rosse: Tin and Copper?
I think Herschel's experiments with glass came later. (I visited a
Herschel museum in Bath a number of years back, and think some of the
mirror molds were made from dung!)
...Bob...
> > Rashad Al-Mansour wrote:
> >
> > > Before he became Sir William Herschel, world famous
> > > astronomer, his *real profession* was as a Composer,
> > > Musician and Conductor. Like us he was an amateur
> > > astronomer and ATM when he had the time to pursue it.
> > >
> > >
> > >
> > > Question One: Out of the 144 pieces of music that he
> > > wrote during his musical career how many were
> > > Symphonies?
> >
> > Didn't know he'd written that many pieces! I do know that 24 of 'em
> > were symphonies.
> >
> > > Question Two: What was the material he polish to create his
> > > first mirrors?
> >
> > I thought he used tar-pitch. Or did his use of this material come
> > later?
> >
> > ..Bob...
> >
>