Stephen Humphries wrote: > I have said on numerous ocassions that for small distances the mm > is ideal, > bigger than that and I choose the inch or the foot. There is > nothing wrong > with me doing this, the ability is there for me and is available > for me to > choose.
You seem to confuse the size of the measurement with the required level of precision. For example if I were constructing a book case say a metre long and about 80 cm tall, I'd be inclined to mark out the materials and cut it as best I can to mm precision. If I measured everything to the nearest cm chances are it wouldn't fit together properly because things were made too inaccurately. On the other hand of I were given a description of the assembled item with a view to buying it, then cm precision would be sufficient. The same would apply for a book case in imperial dimensions. The nearest inch is way too big for construction purposes, you'd have to go to fractions. May be alright for a guide to overall size when buying it though.
