Thanks for the great info, Attilla. I'll try to make it to Carp on the 17th.
-Tony.
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--- In OAFs@..., "Attilla" <attilladanko@...> wrote:
Idiot at the keyboard. Right. Here are some corrected sentences:
--- In OAFs@..., "Attilla" <attilladanko@> wrote:
But I can use a sight-tube.
But I *can't use a sight-tube.
If you're sucking air out of the tube, I suggest a big a fan (or as >many fans) as you can get. The key in this case is to seal the >bottom of the tube so the fan(s) dosent(dont) use suction.
bottom of the tube so the fans don't *loose* suction.
And I should have added:
You need to suck a heck of a lot of air out of the bottom of a tube to have same affect against blowing at the back of the mirror.
However, sucking cools the mirror without distorting its figure. (Back-blowing fans can cause a local cool spot). Also, enough suction will suck some of the turbulent boundary layer off the front of the mirror making them almost as good as boundry-layer fans.
It hink filtering is especially important in this case.
I *think* filtering is especially important int his case (of boundary layer fans blowing across the mirror face).
I need to hire a proof reader
