Recent content by Modulo2pi

I thought the procedure for posting to a locked thread was to petition a mint or... (darned voice recognition, I said mentor)... letting the mentor know what the valuable information is you wish to add, that way if the information you wish to add is valuable, then it can be added.(!

With a thread title like that, what do you expect? (...and can we expect a similar thread next year... at about this same time?)(!

I use a mechanical pencil now too, but get the type with the smallest diameter lead possible; that way you get a greater lead-onto-paper pressure while using less hand-onto-pencil force. (Just think of the physics at play here!) : wink : (!

I recommend step 3: use a softer lead pencil... Go to office depot or staples & buy all the levels of soft lead... Then start with the softest & work your way up a level if it's too soft... Remember, the soft lead means you use less pressure to write... I had this problem too & I can say...

Yes, I was wondering why to use N2 myself too. I saw that you had reasonably answered the question, and that naturally begs the question of "why not to use N2" That's the question I attempted to answer! So that others can know of alternatives, and learn from my mistakes!(!

You're right, if the finished product will be exposed to air anyways. but my experience with R&D meant opening the chamber for adjustments and modifications only to continue the run later. Nitrogen and oxygen were the two worst

Don't use nitrogen if it's use is detrimental. ie: for some processes, it poisons the stuff you're trying to make.

... Obtaining materials with similar coefficients of thermal expansion is mandatory, or else the seal will fail when the chamber is heated... yes and I understand similar coefficient of thermal expansion is required simply for the manufacturing process. Dissimilar cte will cause the bond to...

For someone who likes the tradition of for next loops, it seems VERY odd to have the next line: i = 0 (!

Will you let us know how the project fared? If the Earth is too unforgiving a place for this telescope, why not build one on the moon? This way, the difficulties involved in construction could get worked out before starting on the Earth based telescope. And remember, whether it's the Earth or...

I'm new here so this chat feature is new to me, but none the less I am excited! P.S. to anyone questioning the veracity of the title of this thread: you have to be pretty narrow minded to call it a lie. In fact, the philosophy behind Heisenberg's uncertainty principle allowed for complete...

http://en.m.wikipedia.org/wiki/Glass-to-metal_seal browsing through these vacuum system Threads, I found this unanswered question, and thought I would contribute information I found on Wikipedia