Dating a chemical slide rule by atomic mass data

The table of atomic weights on the back of some chemical slide rules can be used to date these slide rules, assuming the manufacturer used the most recent International Comittee (IUPAC) values.

This tools helps you to date a chemical slide rule.
You can do two things:

The results are depicted in colors:

 (bold green)   IUPAC mass corresponds to the atomic mass on your slide rule.
 (yellow)   All IUPAC masses for this year correspond to the atomic masses on your slide rule.
 (less yellowish)   All but one IUPAC masses for this year correspond to the atomic masses on your slide rule.
 (even less yellow)   All but two IUPAC masses for this year correspond to the atomic masses on your slide rule.
 (grey)   You did not specify an atomic mass for this element.

  Your slide rule name:
  1. Data from "History of the recommended atomic-weight values from 1882 to 1997: a comparison of differences from current values to the estimated uncertainties of earlier values", Pure Appl. Chem. 701 (1998) 237-257 [http://www.iupac.org/reports/1998/7001coplen/list.html]

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Andries de Man, Jan 2007