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May I go back to the Zerbee FixFinder, discussed in Navlist 6509 and other
postings, about which I wrote-

It's a Zerbee "Fix Finder".Perhaps it's THE Zerbee Fix Finder. described in
the US patent 2519532 , attached. It could be the prototype, perhaps the
one-and-only, because it's labelled serial number 1; the invention of LouisB
Zerbee, patent granted 1950. You can dial up the details in GooglePatents.

=============================

Although the object itself is no longer on sale, I've been taking a closer
look at the patent for this instrument, which has interested me, and wonder
if anyone else has done the same.

It's a VERY complex instrument, and whoever did the diagrams and the
explanation has made a reasonable shot at it, in the circumstances.

I think I am making sense of it until I get to the start of column 6, in the
"mode of operation", which states -

"... member 122 is adjusted to cause its carriage 123 to move into contact
with member 118. Member 122 is then used in reading the angular position."

I can't find 123 on any diagram, or any other reference to it in the text.
Am I missing something simple, or is there an error in the text or the
drawings? Should that reference to 123 really be to 120? If so, which points
make contact, and how does the user detect that contact? This seems to be at
the nub of the whole observation.

Any ideas?

George.

contact George Huxtable, now at george@hux.me.uk
or at +44 1865 820222 (from UK, 01865 820222)
or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.


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