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Antique German slide rule. Germany 1906-1913 ALBERT NESTLER No. 37,D.R.Patent. Albert Nessler system 23R Rietz c 1906
The dimensions of the ruler cover are 29 cm x 4.5 cm x 1 cm.The dimensions of the ruler are 28.5 cm x 3.7 cm x 0.5 cm.
⠀Separation according to the style of railway tracks. Screw plates. The patent for the "DR 173660" type rulerwas filed on April 26, 1905 and issued on July 27, 1906.The front scale[extended] is 27 cm. // K, A [ B, KI, C ] G, L || 1:25 6.5 cm.The rear scale is [ S, S&T, T ], Stroke: 28.5-54 cm. A multiline cursor.Reverse side: Equivalents (German, French and English).
