Transposition Brackets

[NW Mailing List]

I remember seeing an article in the N&W Magazine (probably in the 1950's) 
about the introduction of transposition brackets so that communication lines 
could be placed on signal poles in order to eliminate separate communication 
pole lines.

Gordon Hamilton

----- Original Message ----- 
From: "NW Mailing List" <nw-mailing-list at nwhs.org>
To: <nw-mailing-list at nwhs.org>
Sent: Sunday, July 29, 2007 1:52 PM
Subject: Transposition Brackets



> In the days of the telegraph and telephone, both the ACL and the Norfolk

> Southern had transposition brackets on the cross-arms of lineside 

> telegraph

> and telephone lines.  If two wires stay parallel for a certain distance 

> they

> have a tendency  to induce each other's signal. To prevent this 

> possibility

> there are transposition brackets placed at strategic cross-arms. This

> bracket has one insulator located above the cross-arm, and another

> insulator positioned below the cross-arm to take the two wires 

> temporarily

> out of being parallel for a short distance, thus preventing line induction

> between the two lines.  Did the N&W use these devices?   Or more to the

> point,  are there any of them left on today's lineside cross-arms?  I know

> that they were used widely by AT&T and regional telephone companies.

> Bill Sellers

> Gainesville,Ga.

>

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