I mounted this in my timber tube; the focus was ten feet.

When everything was complete I tried my instrument on the sky, and found it to have good defining power.

The diameter of the other glass I have made is a little under six inches.
"You ask me if their performance satisfies me?
Well; I have compared my six-inch reflector with a 4 1/4 inch refractor, through my window, with a power of 100 and 140.

I can't say which was the best.

But if out on a clear night I think my reflector would take more power than the refractor.