
Double Gyroscope Apparatus, with components
1890
1890
1849
1897-1910
1951-1960
1900-1939
1885
1910
1900-1960
1900-1905
1886
1886
1900-1980
1886
1900-1960
1900-1920
1886
1897-1918
1900-1905
1870-1910
1886
circa 1885
1900-1980
1950-1960
1918-1949
1851-1900
1912
circa 1900
1912
1885
1901-1914
1900-1960
1890-1939
1897-1918
1900-1960
1900-1960