Ḥayyim Selig ben Ya'akov Slonimski, also known by his acronym ḤaZaS, was a Hebrew publisher, mathematician, astronomer, inventor, science writer, and rabbi. He was among the first to write books on science for a broad Jewish audience, and was the founder of Ha-Tsfira, the first Hebrew-language newspaper with an emphasis on the sciences.
Ḥayyim Selig Slonimski
Slonimski in the 1840s
Slonimski's grave at Warsaw Jewish Cemetery
Abraham Jacob Stern was a Polish Jewish maskil, inventor, educator, and poet. He is known for his mechanical calculators.
Portrait of Stern by Antoni Blank (1823)
Abraham Stern demonstrating one of his calculating machines in Warsaw