Local Thorn Gamma 6s

This 1980s' style Gamma 6 is fitted to a Post-Top bracket in the South Derbyshire village of Melbourne. Notice that the bracket has a lid - this is where the control gear would be placed for a gearless lantern; though this Gamma 6 is likely to be gear-in-head, with the result that the bracket is likely to be devoid of any equipment. I have not seen this lantern working but it probably uses either a SOX or a SON lamp.

Since this picture was taken, the installation has been removed.


By the 1990s, the canopy of the Gamma 6 had shrunk in depth somewhat but there were no other changes to the lantern appearance-wise. This example is on the footpath which runs behind our old house - I could see the lantern from my bedroom (back then a GEC Z5698U was fitted; which is why I have such an affection for this lantern as a collector) and would frequently watch it switch on and warm up - not knowing anything as to how this happened and what the type of lamp was (it would have been SOX). I remember being quite upset when I noticed that the Z5698U had been replaced - it would have been the mid-1990s, so the Z5698U would have been approaching its 20th birthday - what a shame I didn't collect back then! Fortunately, another Z5698U survives at the beginning of the footpath, and so I am keeping a close eye on this one!

Both the Gamma 6 and the Z5698U were saved into my Collection in March 2010.

This Gamma 6 in a car park off Stratford Road in Chaddesden runs a 125 W mercury lamp.

Another example in the same car park - this has a clear reeded bowl.

The South Derbyshire village of Rosliston is home to a number of wide-canopy Gamma 6s; the only place in Derbyshire (that I know of) where such lanterns exist. This example attached to a seemingly rather short column (perhaps because of the presence of nearby overhead electricity conductors) is fitted with a Zodion SS9-DLS part-night photocell.


As well as also being fitted with a part-night photocell, this example also has a deflector fitted in the back of the bowl, in order to minimise the amount of light being cast into the windows of adjacent properties.


The paint finish on this all-night example's canopy is in better condition; ironically, this is likely to be an older lantern than the two above examples are. Notice the slightly more unusual post-top sleeve fitted to the Stanton 10F concrete column.


A downside to wide-canopied lanterns is that the underside of the canopy attracts airborne dirt rather too readily.


Judging by the presence of a lower gasket on this example, the bowl may be a replacement - the later Gamma Basique lantern including a lower gasket on its bowl, in order to improve the overall IP rating.


Although these examples are geared for 70 W SON lamps, the lanterns were later fitted with ceramic metal halide lamps of the same wattage, as part of a "white light" scheme for the village.






© 2002 - English Street Lights Online