▁head ▁of ▁the ▁Institute , ▁Blo ch ▁served ▁on ▁national ▁scientific ▁coun c ils ▁before ▁and ▁after ▁the ▁establishment ▁of ▁Israel . ▁In ▁the ▁years ▁ 1 9 4 5 - 1 9 4 8 ▁he ▁was ▁a ▁member ▁of ▁the ▁British ▁Mand ate ▁Government al ▁Board ▁of ▁Scient ific ▁and ▁Indust rial ▁Research ▁and ▁of ▁the ▁Scient ific ▁Ad vis ory ▁Committee ▁and ▁of ▁the ▁Palest ine ▁War ▁Supp ly ▁Board . ▁After ▁the ▁establishment ▁of ▁Israel , ▁Blo ch ▁became ▁a ▁member ▁of ▁the ▁Isra eli ▁Scient ific ▁Council . ▁ ▁Cont ribution ▁to ▁Israel ▁In ▁addition ▁to ▁his ▁manager ial ▁respons ib ilities ▁at ▁the ▁Institute , ▁Blo ch ▁contributed ▁a ▁great ▁deal ▁to ▁numerous ▁emer ging ▁organizations ▁and ▁establish ments ▁of ▁" Ha - Y ish uv " ▁( the ▁Jewish ▁National ▁Council ▁in ▁the ▁British ▁Mand ate ▁Palest ine ) ▁and ▁later , ▁of ▁the ▁young ▁state ▁of ▁Israel . ▁He ▁was ▁a ▁board ▁member ▁of ▁Mag en ▁David ▁Ad om ▁( Is rael ' s ▁emer gency ▁medical ▁service ) ▁and ▁of ▁the ▁Israel ▁Mar itime ▁League . ▁He ▁also ▁was ▁active ▁in ▁the ▁National ▁Def ense ▁Committee ▁and ▁in ▁the ▁H agan ah . ▁He ▁was ▁a ▁member ▁of ▁National ▁Emer gency ▁Committee ▁and ▁also ▁took ▁upon ▁himself ▁the ▁duty ▁of ▁heading ▁the ▁Palest ine ▁Air ▁Ra id ▁Pre ca utions ▁( A . R . P .) ▁and ▁the ▁Civil ▁Gu ards ▁in ▁his ▁own ▁town , ▁Re hov ot . ▁ ▁Personal ▁Although ,