HKB
[History of measures.]
As regards land measurement, we may be fairly certain that in the days before the Norman Conquest there was little real, though much nominal uniformity. The only measures for the size of things with which nature has equipped the natural man are his limbs. For the things that he handles he uses his thumb, span, cubit, ell; for the ground upon which he walks, his foot and his pace. For large spaces and long distances he must have recourse to 'time-labour-units,' to the day's journey and the morning's ploughing. Then gradually, under the fostering care of government, steady equations are established between these units:--twelve thumbs, for instance, are to make a foot. Thus the measures for land are brought into connexion with the more delicate measures used for cloth and similar stuff. Then an attempt to obtain some standard less variable than the limb may forge a link between thumbs and grains of corn. Another device is the measuring rod. One rod will represent the arm of an average man; a longer rod may serve to mediate between the foot which is short and the acre or day's ploughing which is large. In laying out a field in such wise that it shall consist of equal pieces, each of which can be ploughed in a forenoon, we naturally use a rod. We say, for example, that to plough a strip that is 4 rods wide and 40 long is a fair day's work. For some while there is no reason why the rods employed in two neighbouring villages should be strictly or even approximately equal[1242]. Taxation is the great force that makes for standard land measures. Then a king declares how many thumbs there ought to be in the cloth-ell or cloth-yard. At a later time he actually makes cloth-ells or cloth-yards and distributes them, keeping an ultimate standard in his own palace. Thenceforward all other units tend to become mere fractions or multiples of this royal stick. The foot is a third, the thumb or inch a thirty-sixth part thereof. Five and a half cloth-measuring yards make a royal land-measuring rod. Plot out a space which is four rods by forty, you will have an acre.
[Slow growth of uniformity.]