Halakha and responsa, the laws of sacred scribal writing
Halakha that rests on scientific knowledge: in Meil Tzedakah he fixed the measure of the “gris” in the laws of stains; the book includes a drawing in actual size to measure by, and at its end a tract on geometry, gathered from Euclid, which he wrote in answer to a question put to him by the geometers of his generation. In Bnei Yonah, whose standing is that of a foundational halakhic work, he ruled that one need not refrain from reading Humashim printed by gentiles.
A rabbi and halakhic authority, one of the great rabbis of Bohemia, a native of Prague, who died young and still made a great impression on the world of halakha in his own lifetime. He was a Torah scribe by profession and acquired broad knowledge of the sciences. Three of his many books were printed after his death: the responsa Meil Tzedakah, after which he was called, Bnei Yonah on the laws of the Torah scroll and Kanfei Yonah on Yoreh De’ah.
The archive doesn’t yet record an unbroken road from Rabbi Yonah Landsofer to the chain of transmission: the trail reaches back to The Maharal of Prague and stops there.