Drei neue Bücher über Rechenschieber erschienen

In den letzten Wochen sind diese drei neuen Bücher für Sammler und Freunde der Rechenschieber erschienen:

  • Ina Prinz (Hg.):
    300 Jahre logarithmisches Rechnen in deutschen Landen
  • Richard Smith Hughes:
    Specialized Slide Rules for Electronic Engineers
  • Rodger Shepherd:
    Pencil Slide Rules and Their Successors, The Calculator Pens and Pentop Computers

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Der Schwangerschafts-Rechenschieber Faber-Castell 51/88 – Text

Today I’d like to present you a very special slide rule produced by Faber Castell, probably in the early fifties. It is a slide rule which is intended to indicate the pregnancy duration and therefore also the expected date of delivery. No other comparable slide rule was known until my specimen was offered on eBay in May 2016.

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