Closed black slide rule case with Albert Nestler lettering and visible wear along the edges

Albert Nestler A.-G. System Rietz No. 23R Slide Rule with Case

€60,00 EUR
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Closed black slide rule case with Albert Nestler lettering and visible wear along the edges
  • Closed black slide rule case with Albert Nestler lettering and visible wear along the edges
  • Back of Albert Nestler slide rule showing reference tables, with the black sliding case open above it
  • Close-up of the glass cursor and numbered scales on an Albert Nestler System Rietz slide rule
  • Albert Nestler A.-G. Lahr i/B maker inscription and System Rietz No. 23R marking between the slide rule scales
  • Close-up of reference tables and the rear scale window on an Albert Nestler wooden slide rule
  • Closed black slide rule case with Albert Nestler lettering and visible wear along the edges
  • Back of Albert Nestler slide rule showing reference tables, with the black sliding case open above it
  • Close-up of the glass cursor and numbered scales on an Albert Nestler System Rietz slide rule
  • Albert Nestler A.-G. Lahr i/B maker inscription and System Rietz No. 23R marking between the slide rule scales
  • Close-up of reference tables and the rear scale window on an Albert Nestler wooden slide rule
Albert Nestler A.-G. System Rietz No. 23R Slide Rule with Case

Albert Nestler A.-G. System Rietz No. 23R Slide Rule with Case

€60,00 EUR
A distinctive technical instrument from an early chapter in calculating technology: the Albert Nestler A.-G. System Rietz No. 23R slide rule, made in Lahr, Baden, Germany. According to the information supplied, this example is believed to date from the early 1920s, during the interwar period. An exact production year has not been established. According to the supplied information, this version combines a hardwood body with a celluloid surface. The slide rule bears the historic maker inscription “Albert Nestler A.-G. Lahr i/B,” alongside the German markings D.R.Patent and D.R.G.M. “Lahr i/B” refers to Lahr in Baden. These inscriptions contribute to its historical character but do not, on their own, establish an exact production year. Complete with a black sliding case, described by the seller as original, this instrument reflects the history of engineering and manual calculation. Its glass cursor, graduated scales and reference tables on the back make it an appealing addition for collectors of early scientific instruments and antique calculating technology. The photos show signs of age and use, including noticeable wear to the black case. Operation and calculating accuracy have not been verified; no calibration or accuracy is guaranteed. Please examine the photos for the visible condition. Stated dimensions: 30 × 4.5 × 2 cm. Stated weight: 145 grams. Only one example of this product is available. Tracked shipping is charged separately.

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