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Our holdings include hundreds of glass and film negatives/transparencies that we've scanned ourselves; in addition, many other photos on this site were extracted from reference images (high-resolution tiffs) in the Library of Congress research archive. (To query the database click here.) They are adjusted, restored and reworked by your webmaster in accordance with his aesthetic sensibilities before being downsized and turned into the jpegs you see here. All of these images (including "derivative works") are protected by copyright laws of the United States and other jurisdictions and may not be sold, reproduced or otherwise used for commercial purposes without permission.

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[REV 25-NOV-2014]

 
 
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VINTAGRAPH • WPA • WWII • CHRISTMAS PRINTS

A Higher Calling: 1929

A Higher Calling: 1929

Washington, D.C., 1929. "Chesapeake & Potomac Telephone Co. lineman." National Photo Company Collection glass negative. View full size.

 
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Pole Linesman School

A long time ago (1950s)I was at Camp (now Fort) Gordon outside of Augusta, GA which had signal corps schools. One of them was for future linesmen. To support their training, there was a decent sized field with nothing put poles for them to learn to climb on. After an unnumbered soldiers had climbed up and down on them they were, to say the least, covered in splinters. One did not want to loose their footing and slide down the pole.

Rolled up pant cuffs; a fedora and a set of 'slack blocks'

I'm long retired from the electric utility business although this crusty old timer brings back memories of a simpler time. The pant cuffs were almost always rolled up a little to keep the wearer from an adverse tightening in all the wrong places while climbing and moving about on the pole. The pant legs were then pulled UP slightly while strapping on his "hooks" or climbers; then the body belt and safety strap (often called the scare strap) combination was strapped on around the hips....NOT the waist.
He is apparently, in the business of installing or repairing a conductor as he is using a set of slack blocks (small block and tackle) with a wire grip or 'come-along' on one end of the slacks. The other end has a strong steel hook which can be attached around a piece of hardware as to have a place to pull against and tension the wire before splicing.

Transposition

This is also used in three-phase transmission lines to equalise capacitance to earth...

Transposition insulators

Bottom row, 3rd from the right is a tramp [trade name] insulator. A two piece to be exact. I would love to know the color of it. The one in my collection shaped like that one happens to be a rich green, and it took several years to find a top and bottom in decent shape. Pictured is my purple two piece tramp. Believe it or not, these are found in a lot of collections.

Phantom Circuits

Phantom circuits were derived by tapping the repeat coils of two open wire circuits. This was accomplished in the central office. The open wire pairs used for phantom circuits were no different on the poles than non-phantom circuits. This innovation occurred sometime prior to 1916.

Bucket trucks need not apply

I wonder if any linemen still climb the poles with spurs and a leather belt.

nixiebunny's photo

nixiebunny's like has carrier systems (or maybe PGCUs) rather than voice or telegraph.

High tension

Look at all the splices and note how the lineman appears to be making yet another one. Maybe they stretched the wires a bit too tightly.

1929 Lineman Safety Meeting Transcript::

"Be careful up there, Joe."

More Brackets

OldeRadio is correct. In the picture, though, are some brackets which support three wires (plus the one on the crossarm, for a total of four). This suggests that "phantom" circuits are used here. Obviously, a pair of wires is one circuit, and must be "twisted" to reduce crosstalk. A "phantom" circuit used the two wires of one pair for one side of the "circuit", and the two wires of another pair for the other side. Thus, four wires could carry three circuits, with no wire common to any of them. The four wires would also have to be "twisted" in the same manner; hence, the larger brackets here.

Transposition Insulators

are what they are called. Railroad telephone and telegraph poles also incorporate the same arrangement.

It still exists here and there

There's a couple miles of four-pair open line on Arizona highway 86 west of Tucson, just east of the Border Patrol checkpoint. It has a different style of bracket for the twisted pairs.

I like to think of it as a Claes Oldenburg version of an Ethernet cable.

Brackets

Selected pairs are rotated, or twisted, to reduce crosstalk. There is always some mutual coupling between the wires; by twisting them the adjacent wires alternate a few times in a mile to help cancel the coupling between pairs. If you folow the lines for several miles you'll see that each pair gets a half-twist every half mile or so. In multipair cables the pairs are twisted fairly tightly for the same reason, and color coded for identification.

Why the Brackets?

When I was a boy growing up in northwest Ohio, we often drove Route 53 between Fremont and Tiffin. This picture was repeated countless times until underground cable was installed circa 1965.

One thing I always wondered -- and still do -- is why some of the insulators were mounted on descending metal brackets and not on the horizontal crosspieces as the others were?

 
SHORPY HISTORICAL PHOTO ARCHIVE
Shorpy.com | History in HD is a vintage photo archive featuring thousands of high-definition images from the 1850s to 1960s. (Available as fine-art prints from the Shorpy Archive.) The site is named after Shorpy Higginbotham, a teenage coal miner who lived 100 years ago.

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