[TowerTalk] Acuity

[Fred Hopengarten]

From:
Fred Hopengarten  K1VR               781/259-0088
Six Willarch Road
Lincoln, MA 01773-5105
permanent e-mail address:  fhopengarten@mba1972.hbs.edu
if sending attachments:  k1vr@gis.net

Gentlemen:

	I had a client who took a whole new approach to the visibility of
towers issue.  Unfortunately, he recently died -- of reasons unrelated to
the stress of applying for a tower (which I secured).  We never had to
fight the fight for which we were preparing, so I never got my hands on
the original material.  However, here's what he wrote:

Date: Wed, 17 Jun 1998 23:00:15 +0000
Subject: Guy Wires

Dear Fred, 3/16 diameter guy wires become invisible at 54
feet (53.6 ft).   "Principles of Television
Engineering", D.G. Fink, McGraw-Hill, 1940, p. 32. 


Apparently this book has a formula in it which discusses acuity of the
human eye. Does anyone here have the book? Or a similar formula?  This
doesn't help when you neighbor gets upset, but it does help when someone
says:  "I'll be able to see it from clear across the bay."  

I suspect that anyone who works on TV, computer monitors, or who is an
optometrist or opthalmologist, might be able to contribute to the
question:  At what distance does a thin object disappear to the human
eye?

-- Fred K1VR
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