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In the top of the signal lamp case was a Pyrometer which had a bi-metallic switch
If not regular adjusted the signal would not display the correct OFF on ON indications to the driver
This box measures 15 1/2" long
Older face repaint and back is original
for the Union-Castle Mail Steamship Co Ltd
RA 6666 G.W.R. DOUBLE LINE SPAGNOLETTI BLOCK INDICATOR. trader-pitch In the top of theA Great Western Railway double line Spagnoletti block indicator in totally original ex signal box condition, this instrument is complete and in tested working order. The case work has a nice patina and the flag both swing freely.
