posted on Mar, 19 2004 @ 04:08 PM
Originally posted by groingrinder...It would be far more educational for you to BUILD a telescope with your kids...
Firstly, very many thanx for this reminder Kano!!
groingrinder - thanx for the links - very interesting stuff - and a great idea too!
I once ground an 8.5" F9.6 newtonian reflector pyrex mirror (with a friend ) and found it fascinating - surprising hard work too!!
The real challenge, however (for Dave and I), was testing and polishing the mirror to an acceptable accuracy. We used the
and found it extremely difficult to see the shadows on the mirror (the grinding/
polishing took place in a single garage - on a perforated oil-drum) and the testing in the kitchen (the pitch lap was produced in the garge
incidentally, using a Primus stove - NOT the wife's cooker!!
So, there was a lot of "to'ing and fro'ing" between the kitchen/ garge as adjustemnets were made.
However, the "first light" experiments - conducted by wetting the mirror surface and looking at the Moon - were incredible - essentailly, we propped
the mirror up (carefully!) and viwed the image off-axis with a low-powered eyepiece (a 40mm fl). Although we didn't pretend to be precision opticians
(we estimated the mirror was 1/4 wave accurate) the feeling of "self-satisfaction" was wonderful!!
I now use a Celestron 8.5" SCT but the memory of the home made telescope "adventure" still lingers!!
I've always fancied making a spectro-helioscope.... Hmm, now *there's a retirement project....