Ordnance Survey. Applied to wooden troughs used to support the chain in measuring a base-line of an Ordnance Survey.
| 单词 | θ7430 |
| 释义 | the world > the earth > earth sciences > geography > map-making > surveying > [noun] > surveying instruments > chain > trough to support (2) coffer1785 Ordnance Survey. Applied to wooden troughs used to support the chain in measuring a base-line of an Ordnance Survey. coffering1785 An arrangement or structure of coffers. In quots. referring to the ‘coffers’ or troughs used to support the chain in measuring the Ordnance Survey… |
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