154. Rectory Road / Church Street, Clowne Situated in the centre of this junction stands an 8 m tubular steel column topped with a Thorn Gamma 4 multi-lamp post-top lantern. This is the smaller (914 mm diameter) version of the Gamma 4; the larger version being 1219 mm. The lantern is designed to operate up three 250 W or 400 W MBF or SON lamps; however, whilst I suspect that this example will run SON lamps, I do not know the quantity of these, as the junction that the lantern serves is not particularly busy, nor is it particularly large.
What appears to be a Royce Thompson P10 photocell can be seen on the right-hand side (in this view) of the lantern's canopy.
The double-door arrangement of the column can be seen here; this is a necessity, owing to the multiple control gear sets required for this remotely-geared lantern.
Visible on the column here are a couple of bolts - these provide a rest for the lower section of the lantern during maintenance; this unscrews and then slides down the column shaft to the bolts, in order to unlock the lantern. Official Thorn literature suggests that where the lantern is mounted to a non-Thorn column, three stops spaced at 120 degree intervals should be used - unlike the two bolts spaced approximately 180 degrees apart on this example.
The three fins that are cast into the lower section provide some tactile grip for loosening and tightening the section.
< Previous | Next >
BACK TO SURVIVORS PAGE
BACK TO INDEX PAGE
CLICK HERE TO MAKE A MONETARY DONATION
© 2002 - English Street Lights Online