[NJARC] Using a LED flashlight to show numbers on tubes

[Pete Malvasi]

I had once read, and successfully tried man times, that rubbing the envelope on your hair produced a thin layer of oil which allows the invisible or nearly invisible numbers to be seen. 

Sent from my iPad

On Apr 10, 2012, at 16:24, Thomas Lee <thomas_v_lee at hotmail.com> wrote:

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> came across this vid on youtube
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> http://www.youtube.com/watch?v=MBE6j_qeNp0&feature=g-all-lik&context=G28031b4FAAAAAAAAGAA
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> Using a LED flashlight to show otherwise invisible numbers of thermionic valves (Tubes) I
> have a 1933 Lissen Skyscraper 3 radio (1933) and I couldn't read the 
> numbers on the tubes, even in bright sunlight and using a loop I could 
> only just make out part of the numbers on one of the tubes but the 
> other tube was totally unreadable. I've found that using a small LED 
> flashlight I can easily read numbers that are otherwise invisible. It doesn't
> work in daylight, you need to work in semi darkness for the flashlight to 
> work. please let me know if this helps you. 
> 
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