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 Zissel Ziv idea and the Talmud Torah remained open in Grobin until 1886. In that year, Simcha Zissel's health took a turn for the worse and his doctors warned him that there was real danger to his life if he continued making the effort that the running of the yeshiva in Grobin required. At this point, Simcha Zissel was forced to close the Talmud Torah in Grobin. With the closure of the Grobin Talmud Torah, the focus of his work shifted back to Kelm, which now regained its former prominence. Simcha Zissel established a group that was known as "Devek Tov," comprising