Transposition Brackets

[NW Mailing List]

Here is a side comment on this.  Power lines do the same thing for the 
same reason.  You still see this done in locations outside the cities.

Kurt Kramke

NW Mailing List wrote:


> 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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