dumpy level Measurements telescope: 6 1/2 in; 16.51 cm overall in case: 6 in x 8 1/8 in x 5 in; 15.24 cm x 20.6375 cm x 12.7 cm place made United States: New York, Troy Related Publication W. & L. E.

Modern safety regulations mean that Dumpy Level cannot currently be permanently open to the public. Follow BBC Kent on Facebook, external, on X, external, and on Instagram, external.

I’m standing 50 metres below ground level at Dover Castle – though given how high the cliff is, I’m still quite high up in comparison to sea level – where the “secret” Dumpy tunnels ...