Note: To protect the privacy of our members, e-mail addresses have been removed from the archived messages. As a result, some links may be broken.
Anyway, the guys at the Hurd Creek Hatchery in Sequim, Washington came up
with this waterworld viewer. Necessity pushed its invention - they needed
something to use for watching chinook salmon without spooking them. Chinook
are very rare. Disappearing. Soon to be on the endangered list.
So, they took some PVC pipe, 6 inches in diameter and glued a piece of
round glass cut to fit, into the end. On the other end, they put little
handles (like for a periscope). You place the glass end in the water,
holding the handles, then view through the hollow end.
The most effective length depends on lots of things, but theirs is about 3
feet long. Actually, they routed the inner edge of the PVC to glue in the
glass more snugly. Plexiglass would also work.