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- 22:53, 27 May 2008 Wechselstrom talk contribs uploaded File:Nystrom Calculator.png ({{Information |Description= Drawing of a calculator designed by John W. Nystrom |Source= ''Project of a New System of Arithmetic, Weight, Measure and Coins, Proposed to be Called the Tonal System with Sixteen to the Base''. Philadelphia: J. B. Lippinc)
- 21:26, 27 May 2008 Wechselstrom talk contribs uploaded File:Nystrom Tonal Clock.png ({{Information |Description= Hexadecimal "Tonal Watch, or Clock-dial" designed by John W. Nystrom |Source= ''Project of a New System of Arithmetic, Weight, Measure and Coins, Proposed to be Called the Tonal System with Sixteen to the Base''. Philadelp)