4.5 Years 1930-1939
Number of slide rules: 36.
The vector slide rules became readily available, and a modified Rietz system for the needs of engineers – the System Darmstadt – was established in Germany in 1934. The Darmstadt arrangement placed log-log scales on the back of the slide, and typically includes a P scale on the front. An expansion of Specialty Slide Rules began to take place.
Some notable technical developments: radio, discovery of neutron, nuclear fission, cyclotron patented; radar.
Year | Maker | Model | |
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c.1930 | Hemmi | 40 |
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1930 | K&E | 4093-3 |
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c.1930 | MARC | promo |
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c.1930 | MARC | promo |
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c.1930 | Nestler | 24 |
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1930-1935 | K&E | 4058W |
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c.1931 | Gilson | Atlas |
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1931-1934 | Hemmi | 153 |
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1933 | K&E | 4092-3 |
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1933 | K&E | 4093-3 |
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1934 | K&E | 4095-3 |
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1934 | K&E | Mystery |
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1935 | Faber-Castell | 387 |
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c.1935 | Hemmi | 50/1 |
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c.1935 | Hemmi | 80/3 |
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1935 | K&E | N4096 |
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c.1935 | Novotni | Weight Calculator |
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1935-1938 | Lawrence | 8-B |
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1935-1938 | Lawrence | 10-C |
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1936 | K&E | Mystery2 |
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1936 | K&E | N4092-5 |
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1936-1940 | Hemmi | 153 |
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1936-1943 | K&E | 4058W |
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1936-43 | Hemmi | 32 |
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1937 | K&E | N4053-5 |
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1937 | K&E | 4081-3 |
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1937-1945 | Nestler | 23R |
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1938 | Festus | 10 |
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1938 | Festus | Acu-Rule 10D |
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1938 | Festus | 50 |
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c.1938 | Hemmi | 153 |
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1938 | K&E | N4100 |
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1939 | Acu-Rule | 50 |
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1939 | K&E | N4053-3 |
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1939 | K&E | 4080-3 |
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1939-1947 | UIF Shanghai | 4083-3 |
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