on 2003-09-17 01.06, Michael Payne at [EMAIL PROTECTED] wrote: > > It might surprise you to know that the common copper plumbing pipe sold in > the US is actually hard metric, cannot remember exactly, I think the 1/2" > is 15 mm and the 3/4" is 22 mm, it's just called inch size for the benefit > of Americans, no idea when it happened, but it's definitely hard metric.
Dear Michael, Same here � sort of. The other day, I had occasion to measure a 'half-inch' pipe. It had an internal diameter of 10 millimetres and an external diameter of 12 millimetres, giving it a wall thickness of 1 millimetre. Not a 12.7 mm anywhere! I'm not sure if this was a 'standard' pipe or a 'special'. I will investigate further. Cheers, Pat Naughtin LCAMS Geelong, Australia Pat Naughtin is the editor of the free online newsletter, 'Metrication matters'. You can subscribe by sending an email containing the words subscribe Metrication matters to [EMAIL PROTECTED] --
