Combined graphometer and plummet clinometer, 1663.
1663
1663
1886
1860-1888
1876
1677
1911-1915
1911
1932-1936
1935
1936
circa 1930s
circa 1976
circa 1932
circa 1924
circa 1950
1915-1925
circa 1920
1922
1938
circa 1920
1936
circa 1912
circa 1918
c.1910
1907-1917
circa 1920
circa 1932
circa 1918
1950-1952
circa 1920
1932
1902
circa 1922
circa 1924
1920
circa 1914
circa 1910
1915-1925
circa 1960
circa 1936
circa 1954
1923-5
1911-1919
1924
1860-1888
circa 1910
circa 1930s