Page 60 - Aeronautical Engineer Data Book
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Fundamental dimensions and units   47
                  z


                  a









                        2πk




                                        y



       x


      Fig. 2.14  Helix



      2.9 Useful references and standards
      For links to ‘The Reference Desk’ –  a website
      containing over 6000 on-line units conversions
      ‘calculators’  –  go  to:  www.flinthills.com/
      ~ramsdale/EngZone/refer.htm
        United States Metric Association, go to:
      http://lamar.colostate.edu/~hillger/  This  site
      contains links to over 20 units-related sites. For
      guidance  on  correct  units  usage  go  to:
      http://lamar.colostate.edu/~hillger/correct.htm

      Standards
      1.	 ASTM/IEEE SI 10: 1997:  Use of the SI
         system of units (replaces ASTM E380 and
         IEEE 268).
      2.	 Taylor, B.N. Guide for the use of the Inter­
         national System of units (SI): 1995. NIST
         special publication No 8111.
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