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%center% Der Zeitermittler ("The time investigator")

[purchased on ebay 11 July 2012.]

This post-war nomograph like the [[Site.BlochSchnellkalkulator1924|Bloch SchnellKalkulator]] from several decades before used principles of [[nomography]] to solve calculating problems associated with machine cutting tools.  The device is made of more contemporary materials than the robust Schnellkalulator of 1924, and has less scales.  Nevertheless it provided a simplified approach to estimating the unknown in an equation (on the third scale, by fixing the line between the other two scales) without the skills necessary to use a slide rule and actually evaluate the equation itself by substitution of variables and corresponding arithmetic operations.

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See also [[Site.Nomography|Short bibliography]]