Insulator Collecting UK — Teleramics

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Fullers Patent

corrugated fuller insulator cross section

Key distinguishing points

  • Corrugated design
  • Spindle can be cemented or threaded
  • Extended inner shed
  • One wire groove
  • Made in Brown Earthenware or White Porcelain
  • Patented in 1882 by Langdon & Fuller of Bow.

Buller Jobson


This fine example, obtained at a junk sale, is of a corrugated type insulator, stamped 'Buller Jobson & Co. Dudley, England', and as such can be dated to 1885 - 1887. Made in brown stoneware and in one piece with a cemented in spindle , subsequently broken off inside the inner shed, it was probably used as a line insulator until the standard cordeaux pattern began to predominate and possibly from the Southern region of the UK rail network.

Buller Jobson & Co. Dudley, England close up

Close up of impressed 'Buller Jobson & Co Ltd Dudley, England' mark

Fuller in Cream

corrugated insulator

This and several other cream examples originated from the Midland Railway and are remnants of William Langdon's vision for his telegraph system while he was their Chief Telegraph Engineer. He rebuilt the Midland Railways telegraph network, removing all the original Varleys and replacing them with his white porcelain corrugated pattern for line wires and his own treble shed insulator for terminations.

This insulator, along with several others, were found discarded near its felled telegraph pole. However the insulators on the pole were still in situ and of the standard Post Office pattern dated 1954 predominately, suggesting that the Corrugated insulators were discarded when the pole insulators were changed in the 1950's.

insulator top view

A top down view of the above insulator showing the Fuller Langdon Patent stamp. Made from cream porcelain and Midland Railway (MR) in origin. The stamping, D242, is probably its Bullers pattern number and another example in the collection is similarly stamped D2 (possibly an incomplete stamping).

The fact that this example has a screw thread fixing, though not of the cordeaux pattern suggests an approximate manufacture date of 1882 or later giving a working life of up to 70 years!

Fuller in White

corrugated insulator

Another complete example now in the collection is this pure white version. There are no markings to suggest manufacturer or age but it is probably prior to 1900 and may be contemporary with the original installation.

Several of these were found alongside the cream variant shown above.

Electrical Brown

corrugated insulator

Yet another variation of the corrugated type can be seen here, again unmarked. This the same size as the previous examples consisting of a single piece of cream porcelain coated with a brown industrial glaze and threaded internally to the cordeaux pattern. It was recovered from the Leicester to Burton upon Trent line near Swadlincote.

Mr Langdon was a strictly white porcelain man and finding a brown corrugated insulator on one of his lines suggests it was made /installed after his retirement from the Midland Railway

Langdon Fuller?

insulator fragmentLandon & Fuller patent insulator fragment

These two views illustrate a fourth variant in the collection. They are the outside and inside of a Landon & Fuller patent with cemented spindle. The large grooves on the internal shot show the ridges used to help hold the cement and spindle in place. The patent stamp is situated on the top side face unlike the previous langdon & fuller version which was on the top face itself.

I am pretty certain that this is near 1882 in date and possibly one of the Bullers T223 pattern supplied to Fullers in 1882.