Science/Engineering/Technical forums

My condolences to Bill and Doug’s friends. He was one of a kind and is missed.

I got to know Doug over many years via google video hangouts.

Often, he would quote a line from ‘The Hitchers Guide to the Galaxy’ and I would respond with some another.
Doug, Thanks for all the fish.

Jerry ion pumps have a steep the learning curve. Mine is a triode vacdiode and oddly increased the chamber pressure when ever it was powered on. The trick or rather necessity is a good high temperature bake out. The collector plates are a sponge and when exposed to atmosphere they saturate with ...

Doug Loctite 770 is surface prep for use with Loctite 440 instant glue. The stuff is good for gluing rubber and Teflon. I believe it cuts surface bonds to chemically attach to. Might be worth a test with BN and an o-ring.
-Peter

Bob my setup has a turbo drag and a 4 stage diaphragm roughing pump but running next to you the constant noise gets old fast.

You should consider an ion pump. I have a used 20 l/s Varian which runs at 3300V and the current is an indication of the pressure (100uA is 0.9E-6T). Mine runs continuously ...

Jerry I’d be shocked if you couldn't configure a motor VFD to drive a step up transformer, both are just steel and copper with the same physics. 30 years ago in university we modeled induction motors as transformers.
Enjoy the journey.
-Peter

Jerry,
I am guessing you want a metallic coating so voltage regulation is not that big a deal. How about a rectified pole transformer driven by a variable frequency AC drive?
-Peter

I looked at all the usual suspects for drying awhile back. Some might be fine but probably not great and I did not want to invest in an RGA to know the answer. I liked zeolite as the drying medium and I eventually found a few commercial drying products with specifications that used it.

Zeolites ...

Almost two years ago I did some experiments with a Proton Exchange Membrane or PEM fuel cell. Only a few companies actually make these membranes. This fuel cell came out of a science toy called a Hydrocar. The highest current I ran the cell at was 4.5 Amps while producing 36 sccm of hydrogen gas. In ...

I came across this decay table via the Geiger enthusiast group at yahoo. As best I can figure it was intended for use with the GR-130.
-Peter

I used a poor choice for an angular description. The #64-463 hot mirror has a dielectric coating thickness designed for operation at 45 degree. http://www.edmundoptics.com/optics/optical-mirrors/specialty-mirrors/high-performance-hot-mirrors/3150
As the 45 degree angle is changed the photon travels ...