Jean_LAMESCH_Sliderules_Collection_BOX

1772_ZITA_Jacob_ZEDAK

ZITA, a large 191mm wooden circular simplex slide-rule from the Jacob ZEDAK company in Tel Aviv, Israel. Zedak came from Poland to Palestine either just before or during WWII. The age of the sliderule is probably 1942. This plywood model with simple unprotected paper scales is called "Rav Bo" (an Hebrew term which means "much in it"). Turning the center knob rotates the7 inner scales, with the outer rim with the large numbers 1 to 9 remaining fixed. Read extensive article from N. Zeldes here.