But the Imperial system is so logical. Let's take linear distance for example. 12 inches = 1 foot 3 feet = 1 yard 22 yards = 1 chain 10 chains = 1 furlong 8 furlongs = 1 mile Therefore, in one mile, there are 80 chains, 1,760 yards, 5,280 feet and 63,360 inches. I think I've missed out the rod, pole or perch somewhere along the line, though. Then, for nautical use, there is the fathom, which is 2 yards and the nautical mile, which is a lot longer than the terrestial one. Isn't this much more interesting than the boring metric system, where only 10 and exponents thereof are used as multipliers? :-) Of course, in our industry, we also bastardise things even farther, by the league (3 miles). For example, we may measure (in backward countries) ionic contamination in micrograms per square inch. This is akin to speaking alternate words in a sentence in two different languages. It would be much more logical to use apothecaries' drams per rood, even if nobody knew what the hell you were talking about, but then they don't anyway, when metric and imperial are mixed so haphazardly. Reminds me of an exhibition I was attending in England. The day before opening, I decided I needed another MDF laminate panel, because the stands were so many feet wide, instead of the usual 5 metres. I beetled along to the carpenters' shop and explained our problem. I asked the guy what were the standard panel sizes. He replied 48" by 2 metres. Ugh! :-( Brian Steve Gregory wrote: > Hi All, > > I got my boards back from our fab vendor (the ones that had the trace > thickness problem), and they sent the XRF measurements that they took. > But they're in microinches, is there some conversion that you do to > convert that to copper weight? > > Here's the measurements that I got: > > µin Cu > 1. 170.9 > 2. 173.0 > 3. 170.1 > 4. 170.6 > > Thanks in advance! > > -Steve Gregory- --------------------------------------------------- > Technet Mail List provided as a free service by IPC using LISTSERV 1.8e > To unsubscribe, send a message to [log in to unmask] with following text > in the BODY (NOT the subject field): SIGNOFF Technet > To temporarily halt or (re-start) delivery of Technet send e-mail to > [log in to unmask]: SET Technet NOMAIL or (MAIL) > To receive ONE mailing per day of all the posts: send e-mail to > [log in to unmask]: SET Technet Digest > Search the archives of previous posts at: http://listserv.ipc.org/archives > Please visit IPC web site http://www.ipc.org/html/forum.htm for > additional information, or contact Keach Sasamori at [log in to unmask] or > 847-509-9700 ext.5315 > ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------