Hartington Royal Observer Corps Nuclear Bunker

The box on the wall held a 12 volt fluorescent lamp and a BT junction box.

The plate on the ceiling to the right of the lightbulb in the mounting plate for the Fixed Survey Meter or FSM probe.

The white pipe in the wall was the connection point for the Bomb Power Indicator or BPI.

It's strange to think of three men having to take readings and pass them on, as if it would really matter by then.

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