Search found 1036 matches

by Rich Feldman
Fri Jun 12, 2020 6:41 pm
Forum: Announcements and Site Administration Topics
Topic: Coronavirus pandemic
Replies: 161
Views: 26010

Re: Coronavirus pandemic

Yes. As someone mentioned early in this thread, it's the boomer doomer. And parents of us boomers, of course.
by Rich Feldman
Thu Jun 11, 2020 12:19 am
Forum: Announcements and Site Administration Topics
Topic: Coronavirus pandemic
Replies: 161
Views: 26010

Re: Coronavirus pandemic

Back to Covid, another thing which is going to follow its own trajectory. The extreme lockdowns may be mostly behind us, but the reported infections and deaths are mostly in the future. I think that is not seriously disputed any more than AGW. Even as political manipulation of Covid data collection ...
by Rich Feldman
Fri Jun 05, 2020 4:12 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Mark III Advanced Pressure Control / Deuterium Generation from D2O / Metal Hydride Storage
Replies: 21
Views: 3087

Re: Mark III Advanced Pressure Control / Deuterium Generation from D2O / Metal Hydride Storage

I would go for that. But promised myself not to work on deuterium before I have an operating vacuum chamber again. Cartridge connectors and pressure regulators are easy to get on ebay, but I would first look into hacking the Brunton fuel cell unit on hand. https://fusor.net/board/viewtopic.php?f=10&...
by Rich Feldman
Fri Jun 05, 2020 2:50 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Pulse x-ray generators from ebay
Replies: 6
Views: 612

Re: Pulse x-ray generators from ebay

Here's an update on the last significant content ( a matter of opinion ) from Items for Sale thread. As of June 4, ebay seller Bravosource has one left (down to $285 OBO) and different seller Panhandlesurplus has one about the same ($999 OBO). 113416380923 and 133008279419; you can paste an item num...
by Rich Feldman
Fri Jun 05, 2020 2:29 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Pulse x-ray generators from ebay
Replies: 6
Views: 612

Re: Pulse x-ray generators from ebay

"A _very_ casual run 2, with alpha viewing film and room lights off (but bright indicator lights and panel meters on), showed no visible glow after 3 pulses. Dosimeter moved some more." Third and final run (so far) yielded a DC current measurement and X-ray detection two more ways. Cued a burst of 5...
by Rich Feldman
Thu Jun 04, 2020 11:18 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Vacuum Chamber Construction
Replies: 102
Views: 33601

Re: Vacuum Chamber Construction

Whether Nicolas ends up with threads or a through hole, it helps if it's in the right place. This is where a drill jig, clamped to the work, is better than depending on rigidity of drills and spindles. Especially when first round drilling-out has gone so far astray. (+1 on Dennis's suggestion to fir...
by Rich Feldman
Thu Jun 04, 2020 3:52 am
Forum: Items For Sale
Topic: Deuterium lecture bottles on ebay
Replies: 12
Views: 2815

Re: Deuterium lecture bottles on ebay

Dusting this off to discuss the assay that Jon posted after his purchase. Not sure how it's done in the lab, but there's a minor discrepancy and another minor thing calling for comment. Not significant for fusors. First row says 99.999% Deuterium, which allows non-deuterium total to be 10 ppm +/- ab...
by Rich Feldman
Wed Jun 03, 2020 3:28 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Pulse x-ray generators from ebay
Replies: 6
Views: 612

Re: Pulse x-ray generators from ebay

Moving along, before Richard deletes the thread in Trading Post, here is a picture of device with the lid and control board off. At far end are HV transformer module (around the FE tube) and HV multiplier module (behind and maybe around the tube). 20200517_124533.jpg . Found that my "Inspector" had ...
by Rich Feldman
Mon Jun 01, 2020 10:56 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Pulse x-ray generators from ebay
Replies: 6
Views: 612

Pulse x-ray generators from ebay

This is to repost some bits from a discussion on Trading Post board in May, 2020, after a tip by Andrew Seltzman on April 26. 150kVp, 50ns pulses. 2.5mR/pulse at 12" These are cold cathode tubes, unfortunately they use a positive pulse so they can't be used to drive a pulsed fusor. Seller will take ...
by Rich Feldman
Sun May 31, 2020 11:03 pm
Forum: Images du Jour
Topic: Restoration pfeiffer duo 004
Replies: 15
Views: 1233

Re: Restoration pfeiffer duo 004

Spectacular work! Thank you for sharing. Is the contraption with four blue wheels for pressing ball bearings onto motor armature shaft? I have noticed people with millions of views on Youtube, after posting videos (often wordless) showing the restoration of other rusty old machines. Well justified a...