[ARC5] Parts needed for ARC-5/274-N - splines...

[J. Forster]

A plumber friend once told me gas threads were purposely not tapered, so
you don't get leaks at the thread root by cutting it too deep.

They were sealed with a white lead & linseed oil paste, as I remember. Gas
distribution was all very low pressure, <12" WC I think.

-John

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> On 5/26/2014 5:59 PM, J. Forster wrote:
>> Mike, is the outer thread the same as is used on studio mike stands?
>
> Thread count, probably.  The vintage mic stands, and the majority of ham
> radio mics of that era, used Switchcraft 2501F connectors with a 5/8"
> -27 thread.  I think there's an older designation, but I can't recall it
> at the moment.
>
>> I ask
>> because pipe threads are almost universally tapered, but electrical
>> threads are not.
>
> Quite right.  Which makes me wonder how well the threads did for a
> natural gas distribution system in the 1800s.  They must have used a lot
> of tar or pitch....
>
>     73,
>   - Mike
>
>