Okay. So I use firefox. Well, I woke up yesterday and my address bar isn't working right. The back, forward, refresh and stop buttons are grey and won't work. The address bar will let me surf the web but it won't update the url. (Ex: I'll be on yahoo answers but it'll stay ) Also, if it counts for anything, I use Ubuntu. Please don't ask me why I'm using ubuntu. I know how it works and all but I can't fix this problem.
Depends what brand. i usually just do 1/5. How old is the mix. if its old, put more resin in
The type of glass that's used for the mirror substrates in the large telescopes is much more thermally stable than many other materials. The segmented mirrors in the Keck telescopes in Hawaii are some of the largest in the world.
It's pretty simple actually. Glass used in optical instruments has been formulated to be thermally stable. Other materials like ceramics and metals are too susceptable to temperature gradients and will expand and contract with temperature changes. Optical instruments like reflecting telescopes require thermal stability to reduce or eliminate minute distortion of star images resulting from temperature changes. This is especially important when doing astrometric measurements and astro-imaging.
