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Re: [Phys-L] Child's Law & the Limits on Scaling Arguments & Dimensional Analysis (long)

On 2021/Nov/29, at 10:35, David Bowman < <>> wrote:

Unfortunately, essentially nobody builds vacuum tube diodes like this. Rather, they tend to use a cylindrical geometry with the much smaller cathode on the inside and a much larger anode on the outside.

A common exception is a vacuum gauge. Where the directly heated cathode outside a grid (+ HV to attract the emitted electrons. Since a wire spiral many continue on and ionize the residual gas. The + ions are coiled by the anode wire. The resulting current is a function of the gas pressure. <>

more: <>

bc used another type in his research, the vac-ion pump. The fore pump two sorption pumps.