Simcha Blass Simcha Blass Simcha Blass (November 27, 1897 – July 18, 1982; ) was a Polish-Israeli engineer and inventor who developed the drip irrigation system with his son Yeshayahu. Simcha Blass was born in Warsaw, Poland, which was then part of the Russian Empire, to an Orthodox Jewish family. He was active in the Jewish self-defense units organized in Warsaw to defend Jews during the end of World War I. His engineering studies in Warsaw were interrupted by the Polish-Soviet War and completed after that war. During the war, he was recruited to the Polish Army, there he invented for the
Simcha Bunim Alter cemetery. Simcha Bunim Alter Simcha Bunim Alter (; April 6, 1898 – August 6, 1992), also known as the Lev Simcha (Hebrew: ) after the works he authored, was the sixth Rebbe of the Hasidic dynasty of Ger, a position he held from 1977 until his passing. In 1980, he instituted "Yerushalmi Yomi", the daily learning of a page of the Jerusalem Talmud, similar to the renowned Daf Yomi for the Babylonian Talmud. He died of unknown causes on July 7, 1992 (7th of Tammuz 5752) and was interred in the cave of the Gerrer Rebbes in the Mount of