
Meccano differential analyser, 1947
1947
1947
1930-1955
circa 1978
1973
1966-1973
1939
circa 1938
circa 1930
1934-1944
1955-1965
circa 1960
circa 1970
circa 1970
circa 1970
circa 1955
1925-1935
1935-1940
1933-1943
1960-1970
1955-1970