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Waaay back on May 23, when I suggested the possibility of manufacturing new Bygrave rules, I wrote:
"Even just in the cel nav enthusiast market, I bet you could sell a thousand 
of them [newly manufactured Bygrave rules] if the price was right (under 
$50??)."

I didn't get around to mentioning back then that there is a larger market than 
just celestial navigation enthusiasts. There seems to be a fairly large 
market for slide rules and other manual computing devices in a broader 
community of "engineering arts" enthusiasts and also fans of aviation 
history.

I respect very greatly Ken Gebhart's understanding of the marketplace and Gary 
has said that Ken didn't think this was a commercially viable project. But if 
one or several people were interested in getting the project to the prototype 
phase, then it may be possible to find a manufacturer willing to do a small 
run (a few hundred?) in some part of the world where manufacturing can still 
be done cheaply (I'm thinking of Vietnam, but there are plenty of 
possibilities). And once you've got product in hand, it's just a matter of 
advertising and publicity.

-FER
PS: Apologies if this has already been mentioned (I haven't read all of the 
posts in the threads on this topic), regarding Aquino and Bygrave:
"A regua cylindrica de Bygrave e as minhas Altitude and Azimuth Tables: com 
uma exposi??o succinta da Nova Navega??o Altazimuthal e Isoazimuthal pelas 
formulas e tabuas em tan +/- sec" 
F. R. de Aquino, Imprensa Naval (Brazil), 1935 

An approximate translation of the title: "The Bygrave cylindrical slide rule 
and my altitude and azimuth tables: with a succinct explanation of 
alt-azimuth and iso-azimuth new navigation by formulas and tables in 
tan+/-sec"

I haven't read it; just passing it along.



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