Transposition Brackets

NW Mailing List nw-mailing-list at nwhs.org
Sun Jul 29 18:35:57 EDT 2007


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.

>>

>> ________________________________________

>> NW-Mailing-List at nwhs.org

>> To change your subscription go to

>> http://list.nwhs.org/mailman/options/nw-mailing-list

>> Browse the NW-Mailing-List archives at

>> http://list.nwhs.org/pipermail/nw-mailing-list/

>>

>>

>> --

>> No virus found in this incoming message.

>> Checked by AVG Free Edition.

>> Version: 7.5.476 / Virus Database: 269.10.23/924 - Release Date:

>> 7/28/2007 3:50 PM

>>

>>

>

> ________________________________________

> NW-Mailing-List at nwhs.org

> To change your subscription go to

> http://list.nwhs.org/mailman/options/nw-mailing-list

> Browse the NW-Mailing-List archives at

> http://list.nwhs.org/pipermail/nw-mailing-list/

>

>



More information about the NW-Mailing-List mailing list