??? ???? ?? ???? ???? ???? ??? ?????? ?? ?????? ?????? ?????? ???? ???? ??? ????? ??????.Analog electronic pcs ended up useful for solving problems with constant variables till digital processing advanced.????? ????? ??? ??????? ??????????? ????? ??? ???? ??? ???? ??????? ???????? ?????. ??????? ?????? ??? ??? ???????? ??? ???? ??? ?????? ?? ????