Microscopes
1950-1959 (estimated)
Optics
1960-1969
1918-1960
Heat
1880
Time Measurement
1970-1989 (estimated)
Nuclear Physics
1964-1978
c. 1920-1939
Acoustics
1999
1908-1914 (estimated)
1947
Electricity and Magnetism
1966-1979
Electricity Supply
1890
1954-1964
X-rays
1970-1979 (estimated)
1959-1969
1950-1970
1985-1994
1980-1984
1970-1979
1920-1950
1961-1975 (estimated)
1875-1924 (estimated)
1903
1998
1999-2000
1843
c. 1956
1976-1985
1971-1980
1950-1959
Asian Medicine
1931-1939
1953
c. 1971
1955-1964 (estimated)
1965-1974