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I have Dietzgen catalogues as follows:
15th edition 1941, 17th edition 1955, 22D for 1948, 1953, 1954, 1956 and 1960. None of these have demonstration slide rules. Overhead projector slide rules probably appeared in the early 60s, from what I have read.
On 13 Feb 2021, at 15:11, Karl Kleine <firstname.lastname@example.org> wrote:
I have 3 Dietzgen catalogues: #9 of 1910/1911 (reprint), #13 of 1928, and #22D of 1953.
Unfortunately, none of these contain demo or projection slide rules.
Dietzgen's target was the professional office, not educational institutions, at least in these catalogues.
best regards, Karl
Prof. Karl Kleine - c/o Ernst-Abbe-Hochschule Jena, Germany - email@example.com
Von: firstname.lastname@example.org <email@example.com> im Auftrag von Rod Lovett <firstname.lastname@example.org>
Gesendet: Freitag, 12. Februar 2021 13:45
Betreff: [sliderule] Dietzgen Rules
Does anyone have any details, good images, references etc., of Classroom Demonstration Rules and/or Overhead Projection Rules and/or Slide Projection Rules made by Dietzgen?