4.2 Years 1900-1909
Number of slide rules: 19.
The early K&E Mannheim slide rules began to compete with their European counterparts. Inverse, folded, and cubic scales began to become available as manufacturers appear to have experimented with a variety of standard scale arrangements this decade in search of more efficient computational power. See, for example, the Dietzgen rules with their special “B” scales (1762-B), as well as the inverse scales and “triplex” scale arrangements on the Kolesch slide rules. Specialty slide rules, for example for electrical calculations (“electros”) and for chemical proportions, and so on, came on the scene. The “log-log” scales, invented nearly a century earlier, are re-introduced on the early electro rules in Europe and by K&E on their duplex models at the end of this decade.
Some notable technical developments: Zeplin first flight; Wright Brothers and Kitty Hawk flights; Einstein’s development of special and general relativity; Ford’s Model T automobile.
Year | Maker | Model | |
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1901 | Scofield | Engineer’s Slide Rule |
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1901-1904 | Kolesch | Mannheim |
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1902-1912 | Dietzgen | 1765 |
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1903 | Faber | 350 |
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1903 | K&E | 4054 |
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1904 | K&E | 4041 |
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1904-1905 | Faber | 367 |
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c.1905 | K&E | 4035 |
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c.1905 | K&E | 4041 |
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1905-1907 | Dietzgen | MultiplexProto |
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1905-1911 | Kolesch | 2574 Mannheim |
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1905-1911 | Kolesch | 2713 Stadia |
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1905-1911 | Kolesch | 2832 Triplex |
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c.1907 | Dietzgen | 1762-B |
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c.1907 | Dietzgen | 1762-B |
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1907 | K&E | 4013 Thacher |
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1909 | Stanley London | Fuller’s Calculator Model No. 1 |
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1909 | The American Art Works | Slide Rule for Concrete Slabs |
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1909-1914 | K&E | 4056 |
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