Actually, he does not need any more cerium oxide if he is parabolizing; the residue is the pitch lap is plenty. Better to go too slow than too fast. It is not...
Cerium come today, after only four days. This stuff is about as white as a piece of paper. It REALLY looks like white milk next to chocolate milk if you were...
You do not have 8 waves of correction to go. You have just about 1/2 wave to go. You have not been 8 waves from the parabola ever since you have had it fully...
... 1/2 wave to ... have had it ... waves out. ... use no more ... Yes i will work slowly. I did phrase it worng i mean i still have to go from 1/1.6 wave all...
I would guess that the cerium oxide you have is intended for polishing something other than fine optics. Maybe something liked stones. I haven't seen pure...
Mitchell I meant the brown stuff might not have been for fine optics. The way I have of not being terribly clear is why it took 3 days to get bail. Jerry ... ...
... polishing ... pinkish, but ... and got ... nap on the ... floor and ... arrived ... the mailbox. ... considered ... Yes it is indeed pure white. Lol, a...
... to get ... Don't worry, i got ya. three days? (would it be during a school week ;) ... On Behalf ... polishing ... pinkish, but ... and got ... nap on the ...
Naw. I was fully growed. They kept asking where the body was. And I'd ask "what body?" They said that "I killed him." And I asked "I killed him? I killed...
Hi Thomas, Testing to see if rejoining worked. Matthew Lovell ... From: Thomas Janstrom To: atm_free@yahoogroups.com Sent: Sunday, April 30, 2006 6:01 PM ...
Hi all, I believe you might need some more cerium, otherwise the mirror will stick too much for accuracy. Try washed cerium, then cold press for a while. Are...
... will stick too much for accuracy. Try washed cerium, then cold press for a while. ... No i just got 1 KG. Richard means i do need it. He has told me he ...
A while ago, I posted a comparison of FFT analysis of a many-line interferogram with a null-Foucault image of John A's mirror. The image comparison (in the...
Steve.. I notice that there is a mottled appearance but then I can see that the Concerning the bumpiness of the the FFT=based interferogram in the first url. I...
An poor job of cutting and pasting in the first paragraph corrected. ...... Steve.. Concerning the bumpiness of the the FFT=based interferogram in the first ...
Jerry, ... Actually, no. The fringes are oriented horizontally, however, there is a very faint background ridginess that has the orientation and spacing that...
I do see the those surface details you mention. I did not mean to say there is no lumpiness. And I should not have said equal height all the way around. I...
Anyone else notice messages dissapear from the archives? I lost the link to that project on the 70" mirror by group70 (i found the link) but curiously the...
I have not seen the 70" thing for quite a while. I can't help but believe it would be a curse to have that thing. There is such a thing as just too big for...
Jerry, ... No problem. I'm trying to rerun the analysis with a slightly smaller window to remove the diagonal line artifacts. I can get them smaller, but...
If there is a plane in there, I suppose it could be a front/back surface interference. I guess that is what you mean? I wasn't trying to find fault so much as...
... Mitchell... Do not ever open a message like this one... It might contain a virus and you don't want to go there. James did not send the message, it was...
I'm sure the half-plane window you are talking about is in the fft analysis but I can't help but wonder if there is something in the optical train to cause...
Jerry, ... Yes, the half-plane window is one way to mask off part of the Fourier domain to do the analysis. The FFT is kind of like a spectrogram of an image....
