Fechner's double sound pendulum for testing aural discrimination
1898-1908
Morning after contraceptive pills, Germany, 1986
1986
Siemens & Halske AG radio valve, 1884-1936
1884-1936
Siemens and Halske's ABC Telegraph used in Russia
1850-1897
Railway signalling bell by Siemens and Halske
William Thomson's marine mirror galvanometer, 1850-1900
1854
Double Anastigmat 'DAGOR' Series III Lens.
c.1910
Double Anastigmat Lens.
circa 1912
Double Anastigmat Lens
circa 1910
Goerz Double Anastigmat F.6.8 Lens
circa 1920
C P Goerz Minicord camera
1953-1958
Agfa box camera
circa 1930
Double Anastigmat Type 'B' Serie No.5 Lens.
circa 1910
Lynkeiscope Symmetrical Lens
circa 1890
Silver medal to commemorate H. Meyer (1767-1828)
1819
Circular bronze medal
1825
Circular bronze medal to commemorate Baron von Humboldt
1829
Coin Commemorating Zeppelin world flight, 1929
1930
A machine to Read Askania Kinetheodolite film traces
1940-1945
Portrait, photogravure, Herbert Spencer / Photographische Gesellschaft Berlin
1910-1919
Ludwig
1910-1919
Portrait, photogravure, Tycho Brahe / Photographische Gesellschaft Berlin
1910-1919
Andre-Marie Ampere
1825; 1910
Portrait, photogravure, William Herschel (1738-1822)
1910-1919
Portrait, photogravure, Dmitrii Ivanovich Mendelejeu / Photographische Gesellschaft Berlin
1910-1919
Portrait, photogravure, Hermann von Helmholtz / Photographische Gesellschaft Berlin
1910-1919
Portrait, photogravure, Carl von Linne [Linnaeus] / Photographische Gesellschaft Berlin
1910-1919
Portrait, photogravure, Ernst Heinrich Haekel / Photographische Gesellschaft Berlin
1910-1919
Portrait, photogravure, Otto von Guericke / Photographische Gesellschaft Berlin
1910-1919
Portrait, photogravure, Leonardo da Vinci / Photographische Gesellschaft Berlin
1910-1919
Portrait, photogravure, John Lubbock
1910-1919
Portrait, photogravure, Max Planck / Photographische Gesellschaft Berlin
1910-1919
Portrait, photogravure, Christian Friedrich Schonbein / Photographische Gesellschaft Berlin
1910-1919
Portrait, photogravure, Wilhelm Konrad Roentgen / Photographische Gesellschaft Berlin
1910-1919
Portrait, photogravure, Siemens / Photographische Gesellschaft Berlin
1910-1919
Portrait, photogravure, Emil Du Bois-Reymond / Photographische Gesellschaft Berlin
1910-1919
Portrait, photogravure, William Thomson
1910-1919
Portrait, photogravure, Emil Fischer / Photographische Gesellschaft Berlin
1910-1919
Portrait, photogravure, Eduard Suess / Photographische Gesellschaft Berlin
1910-1919
Portrait, photogravure, Charles Darwin / Photographische Gesellschaft Berlin
1910-1919
Portrait, photogravure, Walther Hermann Nernst / Photographische Gesellschaft Berlin
1910-1919
Portrait, photogravure, Eilhard Mitscherlich / Photographische Gesellschaft Berlin
1910-1919
Portrait, photogravure, Richard Owen / Photographische Gesellschaft Berlin
1910-1919
Portrait, photogravure, Wilhelm Ostwald / Photographische Gesellschaft Berlin
1910-1919
Portrait, photogravure, Allesandro Volta / Photographische Gesellschaft Berlin
1910-1919
Portrait, photogravure, Friedrich Koenig / Photographische Gesellschaft Berlin
1910-1919
Portrait, photogravure, Immanuel Kant / Photographische Gesellschaft Berlin
1910-1919
Photo matrix of a letter 'S' from a Diatronic "S" photosetting machine
1970-1985
Physiological Mercury Thermometer, 1876
1876
Physiological Mercury Thermometer, 1876
1876