| http://www.w3.org/ns/prov#value | - Suffice to mention that there were two types, ordinary and long, and that the most usual size was 12s (meaning that there are 12 of l2s in a foot of glass); these are 6 in long by 4 in wide. - Measuring glass according to weight: Neve quotes a Mr Leybourn as stating that 225 ft of glass equals about 200 lb, i.e. 9 ft is about 8 lb weight.
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