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When Arthur Young wished to ascertain the relative proportions of cultivated and uncultivated land in France, he cut up a map of the country, and weighed them one against the other; but the platometer would have helped him to a more satisfactory conclusion.
The other is the 'Platometer, invented by Mr Sang of Kirkcaldy, described as a 'self-acting calculator of surface; in other words, by using this contrivance, you may get the 'square measure included within any boundary-line around which a pen attached to the instrument may be carried' in the plan of an estate, or a map, for example, where the plots of ground are often extremely irregular in form, and difficult to measure, without much complicated calculation.
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