Search found 94 matches

by AFW
Tue Jul 26, 2016 9:33 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cutting Alumina
Replies: 18
Views: 12662

Re: Cutting Alumina

Do you have a campus glassblower? If so, he will probably have a diamond saw suitable for the diameter of your tubing.
Tony Webb
by AFW
Fri Oct 18, 2013 7:55 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: New candidate for refractory grid metal club?
Replies: 11
Views: 4574

Re: New candidate for refractory grid metal club?

Re carbon grids: the early carbon lamp filaments were made by heating Rayon in an inert gas stream - probably nitrogen, tho' argon would be better. A rayon grid could be pre- formed with the "wires" welded by a drop of acetone. I think carbon also tends to evaporate above red - heat, in a vacuum. To...
by AFW
Fri Jun 29, 2012 10:09 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: High voltage diode
Replies: 10
Views: 3864

Re: High voltage diode

Don't forget that, if the PIV of your diode is 81kV, It is only guaranteed for a rectified output of up to 40.5 kV, as the PIV it experiences will be twice the output voltage.
Tony Webb
by AFW
Sun Mar 11, 2012 10:30 pm
Forum: Images du Jour
Topic: Archived - Unexpected grid rotation
Replies: 18
Views: 6972

Re: Archived - Unexpected grid rotation

I was a bit worried at the "SCR autopsy" pictures on the tesladownunder site. Large semiconductor devices often have beryllium oxide as the ceramic insulator: this is highly toxic when powdered.
Tony Webb
by AFW
Wed Oct 26, 2011 10:08 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: X-Ray shield your Hornyak Button?
Replies: 5
Views: 2872

Re: X-Ray shield your Hornyak Button?

The original "optical" detector for X- rays was barium platinocyanide, or, as it would now be known, barium hexacyanoplatinate. I don't know what range of wavelengths it covered.
by AFW
Tue Oct 04, 2011 6:52 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: AC TO DC???
Replies: 7
Views: 3314

Re: AC TO DC???

The various methods for using a barometer to measure the height of a tall building were given as an answer in a Physics exam by a Danish student called Niels Bohr
Tony
by AFW
Sat Jan 15, 2011 9:13 pm
Forum: Vacuum Technology (& FAQs)
Topic: Simple turbo pump controller
Replies: 54
Views: 41091

Re: Simple turbo pump controller

<t>Alexei<br/> Thanks for the controller circuit. I notice that on the TPH 055 diagram there is a contact "D" that doesn't have a corresponding connector on the controller. Is this contact left floating? Also, contact "E" is labelled as 15V, but is connected to the +5V line of the controller. Is thi...
by AFW
Thu Sep 09, 2010 9:42 pm
Forum: Books & References
Topic: Ernest Rutherford
Replies: 6
Views: 5208

Re: Ernest Rutherford

Another famous quote from Rutherford:
" All Science is either Physics or Stamp - collecting"
- a bit ironic that he got the Nobel for Chemistry.
Tony
by AFW
Sun Jun 20, 2010 8:23 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: I got a power supply too...
Replies: 7
Views: 2964

Re: I got a power supply too...

Idea
Take the glass from the dud meter, and use it for the good one!
Tony
by AFW
Tue Apr 20, 2010 9:10 pm
Forum: Vacuum Technology (& FAQs)
Topic: ikea saladbowl outgassing?
Replies: 8
Views: 2788

Re: ikea saladbowl outgassing?

How is the thickness relevant? Outgassing is the release of an adsorbed layer of gases from the surface. However, the thin metal may distort when pumped down, causing leaks.
Tony Webb