Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!bionet!apple!sun-barr!decwrl!ucbvax!ucdavis!vega.ucdavis.edu!ez004560 From: ez004560@vega.ucdavis.edu (0040;0000009034;0;250;143;) Newsgroups: comp.sys.amiga Subject: Re: Weighing Platters Keywords: HD, lubricants Message-ID: <5028@ucdavis.ucdavis.edu> Date: 3 Aug 89 03:09:59 GMT References: <625@orange6.qtp.ufl.edu> Sender: uucp@ucdavis.ucdavis.edu Reply-To: ez004560@vega.ucdavis.edu (Bruce Rogers) Distribution: na Organization: University of California, Davis Lines: 35 One hundred apologies for adding to this stupidity, but: In article <625@orange6.qtp.ufl.edu> sutherla@orange6 (scott sutherland) writes: > > >7) Then the weight of the platter without lubricant is 400.0000g and > the weight of the platter with lubricant is 400.0004g. Thus you > are trying to measure one part in one million by using the > difference between two large numbers. This is a statistical > nightmare! (Any statisticians care to comment?). If the error > in your scale is 0.0002g, you have a 50% error in your > measurement. NOT GOOD. > ... > >"Orders of magnitude are my life!" > Attach a helium balloon with a 400g lift (or a weight in the atmosphere of -400g.) attach this to the platter before and after adding the lubricant. hopefully this will reduce your error to less than 50% ------------------------------------------------------ Quantum _\/_ 545 Sycamore CellBlock 207 Bruce (6502 RULES!) Rogers |\ Duck ( 0 0) Davis, Ca 95616 Quantum Duck Software, |\ \______/ / \\\ 916-757-2925 ez004560@vega.ucdavis.edu |\ < < | \/ "Cool as a body on ice, hotter than the rolling dice." \________/ Quark! ------------------------------------------------------ Quantum _\/_ 919 Drake CellBlock 146 Bruce (6502 RULES!) Rogers |\ Duck ( 0 0) Davis, Ca 95616 Quantum Duck Software, |\ \______/ / \\\ 916-753-1169 u586182058ea@vega.ucdavis.edu |\ < < | \/