a bit of past history

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highfnum
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a bit of past history

Post by highfnum » Wed Sep 09, 2015 1:30 pm

I had a chance to go to Hartness house museum in Vermont

this is quartz filter used by Henry E. Paul to see proms
I only know of only three people that ever made these in
the last 70 years
has anyone ever used one or know anyone that still use them
qmonochro.jpg
qmonochro.jpg (272.17 KiB) Viewed 603 times

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p_zetner
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Re: a bit of past history

Post by p_zetner » Wed Sep 09, 2015 3:00 pm

From what I can see in the photo, this looks like an early Lyot filter.
Modern Lyot filters are used extensively in observatories.

Peter.

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marktownley
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Re: a bit of past history

Post by marktownley » Wed Sep 09, 2015 7:20 pm

Excellent! Is that a T-thread on the end of it ;)
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