Insulator Collecting UK — Teleramics

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Langdon's Patent

langdon insulator cross section

Key distinguishing points

  • Double or treble shedded
  • Spindle can be cemented or threaded
  • Extended inner shed(s)
  • Twin wire groove
  • Over 20 different variants were made
Langdon insulator

The Langdon came in many variants, bullers listed no fewer than 19 variants! There are three basic sizes, made with either a double shed or treble shed.

I have no complete example yet but I do have what I think can be classified as a large treble shed in cream porcelain from Tamworth Station (LMS Region), with no markings.

A large treble shed in white, top missing. A medium double shed top missing and sheds damaged.

A large white porcelain top and a medium white porcelain top, stamped 83 ?

One of my most recent finds is a medium treble shed from the Great Central Railway near Aylesbury, in cream. The top and sheds are slightly damaged and it remains attached to its fixing bolt, probably cemented in.

All the previous examples except the Great Central find are screw threaded.

The first picture of the following pair is a medium double shed and the second, a large treble shed, is a composite image, (a good top added to a good base), to show the difference in size between the medium and large variants

langdon insulator langdon insulator composite image

Winchcombe Railway Museum

This next photo was taken inside the railway museum at Winchcombe, Gloucestershire. It shows a complete medium sized treble shed in cream porcelain and a medium sized treble shed in black composite, (Telenduron?).

langdon insulators

The porcelain version appears to be very slim, yet of similar height to the composite one and the composite variant is similar in size to my own examples. Is the porcelain variant therefore a 'small' Langdon or just an older example?

Latest Find

Langdon insulator

This is the closest I have come to a complete Langdon and other than part of the inner shed missing, it is in near perfect condition.

Frustatingly all my langdon pieces have no manufacturer or owning company identities, infact the only marks of any note found have been an 83 on a top and a no.9 and F10 on an inside shed.

This example was found with other more damaged pieces of what appears to be a larger Langdon variant and some pieces of Varley No.8's. They were all contained in a buried pile approximately 1 meter square and suggests they were all dumped at the same time, possibly after a single pole was either replaced or removed.

Update November 2005

I now have a complete treble shedded Langdon, identical to the image shown above, no markings and the only survivor amongst a pole of at least 8.

It's reason for survival was simple, it was completely buried under excess ballast and if it wasn't for the fact that a small area was showing through the surface, I would never had found it. This leads me to the conclusion that many of the others were probably intact when the pole was felled and have since been smashed by passers by (well if you call crawling under a hawthorn bush passing by).

Current Known Variants in Collection

Double Shed

White, 4in Diameter, 5.25in High, 1/2in threaded spindle. Found in Western Region

White, 4.5in Diameter, 5.5in High, 5/8in Cemented spindle. Found in Western Region

Treble Shed

White, 4.5in Diameter, 5.25in High, 5/8in Threaded spindle. Found in Western Region

Cream, 4.75in Diameter, 5in High, 5/8 Threaded Spindle. Found in Midland Region

Cream, 4in Diameter, 5.5in High, 5/8 Unknown Spindle (still attached). Found in Eastern Region