Combined graphometer and plummet clinometer, 1663.
1663
1663
1932-1936
1936
circa 1976
1920s
1958-1965
circa 1922
circa 1920
circa 1950
1922
1911-1915
1938
circa 1922
circa 1920
1677
c. 1920
1915-1925
1935
circa 1914
1923-5
circa 1914
circa 1922
1907-1917
1920s
1950-1952
circa 1914
1918
circa 1910
circa 1910
circa 1920
circa 1910
circa 1912
circa 1920
circa 1924
1915-1925
circa 1914
1929
circa 1920
circa 1960
1915
circa 1930s
circa 1954
1876
1922
circa 1930s
1860-1888
1936
1922