Dave and all,
These are called bell& socket suspension insulators for use in electric
power line applications. They are the basic
building block for strings of vertical or horizontal strings of insulators
that are composed of a given quantity of individual units according to
thevoltage of the electric line on which they are being used. That is, you
maysee as few as two on a 7.2/12.47 Y distribution circuit and perhaps 15 on
a 345 kV T-line circuit. They are made in 6" and 10" diameter varieties and
again quantity of given diameter indicates operating voltage of the line
they are deployed upon.
As yours are, they may be made of glass or glazed porcelain. Today's
technology has many utilities deploying much lighter weight units made of
modern man made materials, ie. a fiberglass rod encased in an polymer
covering with molded skirts.
The telephone/telegraph insulators are somewhat smaller and do not have any
metal parts. They are constructed such that the hollow in the center has
female threading and installs by screwing down over a wooden or metal pin
install in the top of a crossarm. The same design is used for most lower
voltage electric distribution lines where the conductor is not under a
deadend or large angle stress.
The telephone/telegraph types were typically made of glass and most electric
distribution pin insulators were/are made of porcelain. Again, many modern
electric insulators are made of polymers.
Have a good holiday weekend.
Milt, N5IA
----- Original Message -----
From: "David Robbins K1TTT" <k1ttt@arrl.net>
To: <towertalk@contesting.com>; "'YCCC'" <yccc@yccc.org>; "'reflector
cq-contest'" <CQ-Contest@contesting.com>
Sent: Friday, May 27, 2005 6:48 PM
Subject: Re: [CQ-Contest] [TowerTalk] insulators "Applications"
> Not if this item is an indicator:
>
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=795&item=6181216329&r
> d=1
> these are not the rare telegraph insulators from the 1890's or so. These
> are more like 1950-1970 vintage I would guess and many of them are still
in
> use today.
>
>
> David Robbins K1TTT
> e-mail: mailto:k1ttt@arrl.net
> web: http://www.k1ttt.net
> AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
>
>
> > -----Original Message-----
> > From: towertalk-bounces@contesting.com [mailto:towertalk-
> > bounces@contesting.com] On Behalf Of Roger K8RI on Tower
> > Sent: Saturday, May 28, 2005 01:42
> > To: David Robbins K1TTT; towertalk@contesting.com; YCCC; reflector cq-
> > contest
> > Subject: Re: [TowerTalk] insulators "Applications"
> >
> > They also might bring a fortune on e-bay if some collectory sees them.
> > Then
> > again, they might not.
> >
> >
> > Roger Halstead (K8RI and ARRL 40 year Life Member)
> > N833R - World's oldest Debonair CD-2
> > www.rogerhalstead.com
> >
> > >> Insulator Applications...
> > >>
> > >> Base insulators for Irrigation Pipe Verticals - they would be
great...
> > >>
> > >> Jack
> > >> W0UCE
> > >> www.w0uce.net
> > >
> > > Now that's the best idea I've heard yet. For those who are asking
about
> > > these things, the ones pictured are about 14" in diameter and 10-12"
> > tall
> > > and weigh about 20# each. One is marked as '18000# test' on one side
> > and
> > > 36000# on the other, the other one is marked just as 40000#.. and yes,
> > > those
> > > are the tension ratings... a bit more than your every day 1/4" ehs.
> > With
> > > a
> > > bit of machining or welding they would probably make good tower base
> > > insulators also.
> > >
> > >
> > > David Robbins K1TTT
> > > e-mail: mailto:k1ttt@arrl.net
> > > web: http://www.k1ttt.net
> > > AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
> > >
> > >
> > >
> > > _______________________________________________
> > >
> > > See: http://www.mscomputer.com for "Self Supporting Towers",
"Wireless
> > > Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041
with
> > > any questions and ask for Sherman, W2FLA.
> > >
> > > _______________________________________________
> > > TowerTalk mailing list
> > > TowerTalk@contesting.com
> > > http://lists.contesting.com/mailman/listinfo/towertalk
> > >
> >
> > _______________________________________________
> >
> > See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
> > Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with
> > any questions and ask for Sherman, W2FLA.
> >
> > _______________________________________________
> > TowerTalk mailing list
> > TowerTalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
>
> _______________________________________________
> CQ-Contest mailing list
> CQ-Contest@contesting.com
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>
>
>
> --
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>
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