[SEL] Thread question

[James Mackessy]

Yup. That's a 5-bar Western or Northern Electric from the first few decades
of the twentieth century, when the old Seller's thread system was still
used. I've see this thread on gauge screws, and although I can't find the
right old handbook at the moment, I believe it's in the number series and is
something like a 13 or 14-24. I'll dig later and try to find a chart. Gun
makers, typewriter makers, sewing machine makers all loved using these
"bastard" threads to confound the average repairman.
Jim Mackessy
----- Original Message ----- 
From: <rdhaskell at juno.com>
To: <sel at lists.stationary-engine.com>
Sent: Monday, January 05, 2009 11:22 PM
Subject: [SEL] Thread question


> Hi all.
> I am trying to make an old telephone generator/magneto function.  The
> problem is the threads that attach the crank handle.  The outside
> diameter of the threads is .267", and the threads measure 24 per inch.
> What in the world is this?
> The only markings on it are the number 48A and "PATD in USA July 1894.
> Thanks.
>
> Ron Haskell
> rdhaskell at juno.com
> Riverside, California USA
> http://picasaweb.google.com/RonHaskell
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