6.1.1 Length and Volume Units
The history of length and volume measurement goes back into the old discipline of metrology? The obvious length measurement has been side-by-side comparison with a standard. The obvious volume measurement is the evaluation of the content of a standard vessel. The early length measurements were based on anatomical lengths. Naturally, the variation in human size was a
basic problem that could only be solved either by averaging or by arbitrary
choice. The sixteenth century woodcut of how to produce a "right and lawful"
rood, illustrated in Fig. 6.1, shows that one should line up sixteen men, tall