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Re: ATM 3-Vane or 4-Vane Spiders

To: <atm@shore.net>
Subject: Re: ATM 3-Vane or 4-Vane Spiders
From: "Bob May" <bobmay@nethere.com>
Date: Thu, 11 Oct 2001 11:19:57 -0700
References: <F216TXrtfQyupGKy3hr00003191@hotmail.com> <001701c1525e$2de684d0$04f4b3d1@STARTQOUS5L8MC>
Reply-To: "Bob May" <bobmay@nethere.com>
Sender: owner-atm@shore.net


Sorry Dick, insert foot and chomp on firmly for a week or so.
<<
Sorry, even with no vanes at all there will be spikes caused by the edge of
the aperture.
>>
Further words in the matter only make you chomp further.
The spikes are from radial obstructions in the aperture while the aperture
edge and any other concentric edges produce and modify the rings in the Airy
Disc.  The two effects are completely different in their appearance although
they are all produced by the same diffraction effect.
Bob May
http://nav.to/bobmay
bobmay@nethere.com
NEW! http://bobmay.astronomy.net

References:
- RE: ATM 3-Vane or 4-Vane Spiders
  - From: "William Thornley" <billt051@hotmail.com>
- Re: ATM 3-Vane or 4-Vane Spiders
  - From: "Richard" <richas@earthlink.net>

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