9 Nov
2007
9 Nov
'07
10:59 p.m.
On Friday 09 November 2007 02:28, der Mouse wrote:
Doable.
The glass envelope for the vacuum takes the form of two concentric
cylinders joined at their ends, topologically a torus. The cathode is
another concentric cylinder, this time of metal or whatever, just
barely larger than the inner glass cylinder, with the grids and
anode/plate forming successively larger cylinders. The heater flame
passes through the centre of the cylinder (which is outside the glass
vacuum envelope), heating the cathode by infrared radiation, much as a
conventional heater does. (The glass forming the inner cylinder needs
to be infrared-transparent and probably high-melting-point.)
This is pretty much the way I pictured it, too...
Working out the details would be a real killer, though.
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
Forget electrcity ... Have a torch heated valve. :)
I'd love to see you keep that flame burning while having a
sufficienltly low gas pressure around the cathode to have a long
enough mean free path for the electrons, Not to mention problems
caused by the ions geenrated by said flame.