2003-01-28 I measured some electrical conduit of the half-inch variety and found it to be 16 mm inner diameter and 18 mm outer diameter. I used a pair of callipers. The only three-quarter conduit that I have in the house is 24 mm outer diameter, inner diameter unknown. I have once section of three quarter flexible conduit with a plastic cover that measures 21 mm outer diameter.
These measured readings are all within +/- 0.1 mm of zero. John ----- Original Message ----- From: "Michael Payne" <[EMAIL PROTECTED]> To: "U.S. Metric Association" <[EMAIL PROTECTED]> Sent: Tuesday, 2003-01-28 20:00 Subject: [USMA:24660] Re: iVDR "inch" drives? > > All US copper pipes, despite being depicted in fractional inches are > actually hard metric, the 1/2" is 15 mm and the 3/4" is 22 mm. I'm not at > home now, but if I remember, it's the outside dimension, the interior would > be about 2 mm less. I can measure it precisely once I'm home. Not even > close to the inch sizes. > > Never seem to have time to read all this mail at home, have to do it when I > travel on the airlines, which happens frequently. > > Michael Payne > > > [Original Message] > > From: Joseph B. Reid <[EMAIL PROTECTED]> > > To: U.S. Metric Association <[EMAIL PROTECTED]> > > Date: 03/1/03 10:15:51 > > Subject: [USMA:24337] Re: iVDR "inch" drives? > > > > Further to USMA 24335 in which Carleton MacDonald gave examples of > > approximate translation of sizes between inches and millimetres, > > French plumbing uses British plumbing standards (possibly the French > > got the bathing habit from the British who learned it from India). > > In France a 1/2" pipe is "un treize" (a thirteen) and a 3/4" pipe is > > "un dix-neuf" (a nineteen). > > > > -- > > Joseph B. Reid > > 17 Glebe Road West > > Toronto M5P 1C8 Telephone 416-486-6071 > > > > --- Michael Payne > --- [EMAIL PROTECTED] > --- EarthLink: The #1 provider of the Real Internet. >
