No, Marcus, he must have a slightly oversized metric tape, making whatever he measures appear to be slightly undersized.
Bill Potts, CMS Roseville, CA http://metric1.org [SI Navigator] >-----Original Message----- >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] >Behalf Of mavi fibe >Sent: Wednesday, April 07, 2004 10:12 >To: U.S. Metric Association >Cc: U.S. Metric Association >Subject: [USMA:29456] 90 mm floppies > > >I've used a couple of metric tapes here in the past to >assess the "true" size of these floppies and in both >of them I've got 90 mm (exactly) as a result with >remarkable consistency... > >Therefore, it is possible Gavin may have a slightly >undersized metric tape... > >Marcus > > --- Gavin Young <[EMAIL PROTECTED]> >wrote: > Most all of my 3.5" inch disks have the >dimmensions >> I indicated, namely 89 mm x >> 93 mm, including my orginal Microsoft and Apple >> Computer operating system >> software disks. Those software disks have copyright >> dates of 1990 to 1997. >> Today I noticed that some of the disks measure 89.5 >> mm by 93 mm, but none >> appear to be as big as 90 mm x 94 mm. >> >> 89 mm = 35.03937 inches and that appears to be the >> size of most of my disks. >> Have you measured your disks, if so what size are >> they? >> >> When was this ISO standard made and is it binding? >> Afterall there is an ISO >> date and 24 hour time standard, but most businesses >> in the USA are not >> exclusively using it (if they are using it at all). >> >> Quoting BigChimp <[EMAIL PROTECTED]>: >> >> > >> > There is no such thing as a 3.5 inch floppy disc. >> > The term 3.5 inch floppy disc is in fact a >> misnomer. Whilst the specification >> > for 5.25 inch floppy discs employs Imperial units, >> the later specification >> > for the smaller floppy discs employs metric units. >> >> > >> > The standards for these discs are ISO/IEC >> 8860-1:1987 (double density), >> > ISO/IEC 9529-1:1989 (high density) and ISO >> 10994-1:1992 (extra-high density); >> > all of which specify the measurements in metric. >> These standards explicitly >> > give the dimensions as 90.0mm by 94.0mm. >> > >> > In most countries, the national standard is simply >> derived from the ISO >> > standard. In the U.S., however, the applicable >> standard is instead ANSI >> > X3.171-1989. That, too, specifies the measurements >> in metric, though. It >> > specifies the catridge dimensions as 90.0mm by >> 94.0mm by 3.3mm and the >> > diameter of the magnetic disc material itself as >> 85.80mm. >> > >> > If you have a floppy disc catridge that does not >> measure 90mm, then you have >> > one manufactured by someone that is not careful >> about manufacturing >> > tolerances. (And you should beware. If their >> product isn't up to >> > specification in one area, it may not be so in >> others.) If the disc measures >> > 3.5 inches, then it is the wrong size. 90.0mm is >> 3.5433 inches. >> > >> > >> > >> >------------------------------------------------------------------- >----------- >> -- >> > >> > ) Copyright 2003-2003 Jonathan de Boyne Pollard. >> All rights reserved. "Moral" >> > rights asserted. >> > Permission is hereby granted to copy and to >> distribute this web page in its >> > original, unmodified form as long as datestamp >> information is preserved. >> > >> > From: >> > >> >http://homepages.tesco.net/~J.deBoynePollard/FGA/floppy-discs-are-9 >0mm-not-3- >> and-a-half-inches.html >> > >> > >> > How did you measure the disks? Did you use a ruler >> or a set of micrometers? >> > >> > >> > If you insist your disks are really not >> dimensioned to the ISO/IEC standard, >> > then refer to the 4-th paragraph above. >> > >> > Euric >> > >> > >> > >> > >> > >> > >> > ----- Original Message ----- >> > From: "Gavin Young" >> <[EMAIL PROTECTED]> >> > To: "U.S. Metric Association" <[EMAIL PROTECTED]> >> > Sent: Monday, 2004-04-05 14:28 >> > Subject: [USMA:29441] Re: USMA digest 1568 - >> floppies really are 3.5 in. on >> > one side >> > >> > >> > > I don't understand why people say that a 3.5 >> inch floppy is not really 3.5 >> > >> > > inches. When I measure my floppy disks to the >> nearest 1/32 of an inch, the >> > >> > > dimentions are 3 1/2 in. by 3 5/8 inches. Thus >> one side is truly 3.5 >> > inches. >> > > Some prometric websites say that instead of 3.5 >> inches it is really 90 mm, >> > >> > > however my disks measure 89 mm x 93 mm. It is >> the opening to the floppy >> > drive >> > > bay that is 90 mm wide (the disk has to be >> slightly smaller or else it >> > won't >> > > slide into the drive)! Prometric people need to >> get the facts straight if >> > they >> > > are to be credible to nonmetric people. >> > > >> > > Likewise the diagonal measure of computer >> monitors and TV screens are still >> > >> > > stated exclusively in inches in the USA, even >> though the dot pitch is >> > stated in >> > > mm. Since the dot metric is stated in metric, I >> wonder why the diagonal >> > measure >> > > is not also stated in metric. I guess it is >> because people don't pay much >> > > attention to the dot pitch except when comparing >> specs, but the diagonal >> > > meausure is something they visualize when they >> see advertising. >> > > >> > > Trade Name! >> > > >> > > It's just a trade name. Just like a half-inch >> pipe is not really a half >> > > inch nor is a 3.5 inch floppy really 3.5 inches. >> > > >> > > I have an idea. Why don't you take the pot back >> to the shop you bought it >> > > from or call them on the phone, explain what you >> did and ask them how a 2 >> > L >> > > pot can be called a gallon pot! Then report >> here. I'd be surprised to >> > read >> > > clerk's answer. >> > > >> > > BTW. when you measured it as 2.25 L, were you >> filling it to the rim with >> > > something? If you were, that is wrong. Flower >> pots are never filled >> > full. >> > > There has to be some space for debris and >> watering. That may in fact be >> > > meant to be a 2 L pot. >> > > >> > > >> >> >> Gavin Young >> http://www.xprt.net/~hightech , >> http://www.renewableelectricity.com, >> http://www.electric-automobile.com >> > >===== >Jesus ONLY settles for THE best, so >what excuse can you possibly give to NOT go SI??? > >______________________________________________________________________ >Post your free ad now! http://personals.yahoo.ca >
