Hi,
Quote from: njen on January 10, 2007, 12:11:48 PM
Actually, while on cm, m, mm, etc, I was wondering why when zooming in and out of the little square preview window to the left of the 3D preview that it displays values in metres, until you zoom in under a metre, then it displays units in millimetres? Centimetres seem to had been skipped altogether.
Just wondering why, that's all...no big deal
You don't have to step down progressively through the units, there's no sort of law about it
. For example, in building ( house and boat building, which I have experience with ) you most commonly use millimetres and metres. When you're measuring things you'd usually say "500" for something half a metre long, i.e. you're talking in millimetres. It can be a real nuisance when you come across a tape measure in centimetres, several of my cheap ones are. It's easy enough to convert, but it's not so convenient and can cause confusion when you're working with someone else accustomed to taking measurements in millimetres.
Anyway, when you're doing stuff like ordering wood you'd say "I'll have 20 metres of 100 x 50", which is 20 metres of 100 mm by 50 mm ( the metric equivalent of 2 x 4 ). You wouldn't order 20,000 mm of 100 x 50, although it's the same thing
.
On the other hand, the maximum size limit for trout in a river I fish in sometimes is 40 cm, rather than 400 mm, in the fishing regs.
Regards,
Jo