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Sign: London - Greenwich - standards of length and height


Address:
Royal Observatory, Blackheath Ave, London SE10 8XJ, UK
Category:
Monuments and History
City:
London For all manhole covers in London
Country:
United Kingdom For all manhole covers in United Kingdom
Shape:
Rectangle
Material:
Metal
Placement:
Wall or fence
Tags:
Standards (length, etc.)
Click here for a map that contains other items in the area

Map Route Route No loc. Around me
On the sign:
Ordnance Survey Bench Mark
The small plate (marked ’G 1692’) is an Ordnance Survey benchmark. Similar marks appear on walls and buildings across the country. The height of each mark above sea level has been measured and recorded. Dating from the 1940s, this particular mark is a replacement for an older one that once existed nearby.

Public Standards of Length
These British Imperial Standards were first mounted outside the Observatory main gates in January 1859 to enable the public to check measures of length.

The stated length is the distance between the inner faces of the two D-shaped studs.
Photography:
2023
Eli Zvuluny
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Comments:
The sign is on the fence near the gate of the Royal Observatory in Greenwich, the place where longitude 0 was determined.

The plaque indicating a height point for reference was taken on the same day Click for a larger image

The sign indicating different length measurements (yard, foot, 2 feet and more) was photographed on the same day Click for a larger image

The sign is one of two signs depicting subjects related to time and measurements Click for a larger image


The signs closest to the current sign (Click to show or hide) Mesh (mosaic) Signs around me

London - Greenwich - The Shepherd 24-hour Gate Clock and The Time Ball
Royal Observatory, Blackheath Ave, London SE10 8XJ, UK (1 Meter)
London - Greenwich - Gate clock mechanism
Royal Observatory, Blackheath Ave, London SE10 8XJ, UK (2 Meter)
London - Greenwich - Prime meridian
Royal Observatory, Blackheath Ave, London SE10 8XJ, UK (15 Meter)
London - Greenwich - The Greenwich Meridian Telescope
Royal Observatory, Blackheath Ave, London SE10 8XJ, UK (15 Meter)
London - Greenwich - Panoramic view from the Royal Observatory
Royal Observatory, Blackheath Ave, London SE10 8XJ, UK (20 Meter)
London - Greenwich - Greenwich Meridian Marker 1750-1851
Royal Observatory, Blackheath Ave, London SE10 8XJ, UK (21 Meter)

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