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The Collaborative International Dictionary
Ordnance survey

Ordnance \Ord"nance\, n. [From OE. ordenance, referring orig. to the bore or size of the cannon. See Ordinance.] Heavy weapons of warfare; cannon, or great guns, mortars, and howitzers; artillery; sometimes, a general term for all weapons, ammunitiion, and appliances used in war.

All the battlements their ordnance fire.
--Shak.

Then you may hear afar off the awful roar of his [Rufus Choate's] rifled ordnance.
--E. Everett.

Ordnance survey, the official survey of Great Britain and Ireland, conducted by the ordnance department.

Wikipedia
Ordnance Survey

Ordnance Survey (OS) is the national mapping agency for Great Britain and is one of the world's largest producers of maps. Since 1 April 2015 it has operated as Ordnance Survey Ltd, a government-owned company, 100% in public ownership. The Ordnance Survey Board remain accountable to the Secretary of State for Business Innovation and Skills. It is also a member of the Public Data Group.

The agency's name indicates its original military purpose (see ordnance and surveying): mapping Scotland in the wake of the Jacobite rebellion in 1745. There was also a more general and nationwide need in light of the potential threat of invasion during the Napoleonic Wars.

Ordnance Survey mapping is usually classified as either "large-scale" (in other words, more detailed) or "small-scale". The Survey's large-scale mapping comprises maps at six inches to the mile or more (1:10,560, superseded by 1:10,000 in the 1950s) and was available as sheets until the 1980s, when it was digitised. Small-scale mapping comprises maps at less than six inches to the mile, such as the popular one inch to the mile "leisure" maps and their metric successors. These are still available in traditional sheet form.

Ordnance Survey maps remain in copyright for fifty years after their publication. Some of the Copyright Libraries hold complete or near-complete collections of pre-digital OS mapping.

Usage examples of "ordnance survey".

But for that they'd need pinpoint accuracygrid references off an Ordnance Survey map simply wouldn't do itand we don't have our techs out here as yet.

After a while he reached for the ordnance survey map and began to unfold it.

She folded out the Ordnance Survey map and together they studied it.

He got out the ordnance survey map and went forward to study the terrain.

Every last bit of it, good and bad - Marmite, village fetes, country lanes, people saying 'mustn't grumble' and 'I'm terribly sorry but', people apologizing to me when I conk them with a careless elbow, milk in bottles, beans on toast, haymaking in June, stinging nettles, seaside piers, Ordnance Survey maps, crumpets, hot-water bottles as a necessity, drizzly Sundays - every bit of it.

Carefully, he spread out the Ordnance Survey map and tried to study it through the eyes of a person who'd decided to run away.

I can show it to you on the Ordnance Survey, if you're interested.

I want to get hold of Ordnance Survey maps for south-east England.

Exposed to the mass gaze was none other than old TQ 17 NE, the Ordnance Survey map of the borough.

And if you take an Ordnance Survey Map for Oxfordshire, you find that the six-figure reference 313/271 lands you bang in the middle of Chipping Norton.

She took the ordnance survey map from its protective plastic cover and spread it flat on the bed's counterpane.