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2019 has been designated the International Year of the Periodic Table as it is the 150th Anniversary of the formulation of Mendeleev's Tabelle I

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There are thousands of periodic tables in web space, but there is only one comprehensive database of periodic tables & periodic system formulations. If you know of an interesting periodic table that is missing, please contact the database curator: Dr Mark R Leach.

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1992

Chemical Slide Rules

The first chemical slide rules are of interest here because they are, in effect, early periodic tables. But the are more than this, as they can be used for performing chemical calculations. Writing in Bull. Hist. Chem. 12 (1992) (and here), William D. Williams of Harding University writes:

"An article by George Bodner in the Winter 1990 issue of the Bulletin described a rare chemical slide rule designed by Lewis C. Beck and Joseph Henry - their little-known Improved Scale of Chemical Equivalents. [My] paper attempts to place this slide rule in context by describing its origins, as well as some of its predecessors and successors."

Some chemical slide rules mentioned in the text:

  • Wollaston's 1813/14 slide rule of chemical equivalents: here, here & here

Nagayasu Nawa writes and provides an explanation as how Wollaston's chemical equivalents slide rules should be used:

"It is very interesting slide rule for me. Because we actually used slide rule in 1960s. There were not the electronic calculator in the world. I think it would be used as a simple slide rule of The Law of Definite Proportions by J.L. Proust 1799."

  • '10 water', for example, may be hydrating water in chemical compound

  • 'Chlorine' may be HClO: HCl(35) + O(10) = HClO(45), etc.

Click image to enlarge:

Thanks to Nawa for the tip!

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