Filings coherer, glass tube with side-pocket attached to mounting bracket, 1894-1904
1894-1904
1894-1904
1960
1873
1875-1900
1933-1939
1925-1935
2013
1801-1910
1801-1910
1735-1900
1651
1933-1939
1930-1960
1801-1910