Hydrant Plate with Booth

From London Fire Brigade site:

The two numbers on the plate show the size of the water main and the approximate distance of the hydrant. In addition to marker plates, all hydrants are displayed on a computer in the cab of every London fire engine so that the nearest hydrant can be located while the crew are on route to a fire call.

This sign, near Westminster Abbey, is still in imperial measurements and therefore is probably older than 1975, when they started changing signs to metric. If this were a metric sign the top number would be much larger since it would represent millimeters and not inches.

I’ve seen a couple of these signs (possibly older ones) that seem to have a “D” coming out of the right vertical bar of the “H.”

I don’t know what it means.

I don’t know what it means.

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