Ḥayyim Selig ben Ya'akov Slonimski (Yiddish: חַיִּים‬ זֶעלִיג בֶּן יַעֲקֹב‬ סלאָנימסקי) (March 31, 1810 – May 15, 1904), also known by his acronym ḤaZaS (חז״ס‎), was a Hebrew publisher, mathematician, astronomer, inventor, science writer, and rabbi.

[7] An advocate for the education of Eastern European Jews in the sciences, Slonimski introduced a vocabulary of technical terms created partly by himself into the Hebrew language.

[8]: 180 In 1838 Slonimski settled in Warsaw, where he became acquainted with mathematician and inventor Abraham Stern (1768–1842), whose youngest daughter Sarah Gitel he would later marry in 1842.

[14][15] In 1853 he invented a chemical process for plating iron vessels with lead to prevent corrosion, and in 1856 a device for simultaneously sending multiple telegrams using just one telegraphic wire.

It ceased publication after six months due to his departure on the eve of the January Uprising from Warsaw to Zhitomir, the capital of the Ukrainian province Volhynia.