Arthur Hasselblatt und sein Rechenschieber von 1889

Arthur Hasselblatt (1853-1897) was a Baltic German from Estonia, but he studied and worked at the Practical Technological Institute of St. Petersburg.
In 1891-96 he was associate professor at applied mechanics dept. In 1889-90 he introduced the slide rule, which I found at a flea market in Turku.

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