Re: strength of vacuum

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Bert Hickman <bert.hickman-at-aquila-dot-net> 

Tesla list wrote:

>Original poster: Ed Phillips <evp-at-pacbell-dot-net>
>Tesla list wrote:
>  >
>  > Original poster: Bert Hickman <bert.hickman-at-aquila-dot-net>
>  >
>  > Antonio and all,
>  >
>  > I've found that some elongated lamps that are intended for scroll lamps do
>  > indeed have a high vacuum instead of inert gas. The glass fluoresces a
>  > brilliant yellow-green color, especially if the filament becomes
>  > incandescent from field emission (with lots of electrons being 
> emitted). An
>  > old antique light bulb I have does a similar thing, only the glass
>  > fluoresces a brilliant blue color. In either case, I could easily detect
>  > the presence of X-rays via a Geiger counter 8 feet away. Remember that
>  > distance is your friend (inverse square law), keep run times down, or,
>  > preferably, don't irradiate yourself at all... :^)
>  >
>  > Best regards,
>  >
>  > -- Bert --
>     What is a scroll lamp and where do you get those bulbs?
>Ed
>
>.

Hi Ed,

It would probably help if I called it by its proper name - tubular 
incandescent light bulb... :^)  They are used in some desk lamps, display 
cabinets, and even exit signs and the 25W one I have looks just like one of 
these:
http://www.abclights-dot-com/tubulart10std.html

The bulb I have came from the local hardware store, and apparently is 
evacuated and not backfilled. I tried to find a brand name it but all it 
says on the base is "120V 25W China"... :^)

Best regards,

-- Bert --
-- 
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