Bench Marks for North Bucks
Granborough bridge. But what's that, bottom left?
What’s this strange metal object built into the bridge? It’s an Ordnance Survey Bench Mark, and it was put there for map making. The number 1967 isn’t the year it was installed; it was built into the bridge in about 1914.
There are thousands of these bench marks in the UK, numbered in sequence on long surveying lines across the country.
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