The beacons are almost identical to each other in appearance; the only difference being that beacon A (the 50 W mercury one) has a black casting.
The beacon globes are all held in place with either screws or bolts, and so this is why they are sometimes seen missing when in use. The mercury and CFl beacons just have regular lampholders and nothing else, but the twin 6 W fluorescent one also has a gear tray, consisting of two ballasts, two starters and a capacitor.
I powered this beacon up first - obviously it isn't very bright, but it isn't meant to be.
I wired up the mercury beacon secondly, using a Venner MS2SP time switch and a Schwabe ballast, and changed the coated mercury lamp for a clear one, to make it resemble the one seen on Station Rd.
The picture below actually shows the beacon at full power, taken without a flash, but you'd be forgiven for thinking that it hadn't been on long!
With the flash on, the beacon still looked very green.
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