Telegraph Key (Morse Code) Type J-37 Dolmen, Neolithic burial chamber 4500 years old, Pembrokeshire, Wales Acoustic echo Cuneiform script Rainhill Trials steam trains, 1829 Triger's caisson, 19th century Young hare, by Durer Perpetual motion machine, 19th century Neolithic hunters 14th century theological cosmography Galileo using a telescope Tomato plant Faraday's electrolysis experiment, 1833 Early astronomical spectroscopy Newspaper printing press Development of Arabic numerals Atauriques in the Nasrid palace, Granada, Andalucia, Spain Durer's Celestial Globe, 1515 Early escalator, 1894 Redshank, historical artwork 1920s television system, diagram Sacred lotus (Nelumbo nucifera) Foot bones and ligaments Galen lecturing on anatomy in Rome Galen's spirit system Boring a hole Torso bones Golden eagle, historical artwork 16th century map of Sardinia cartouche Measuring electric current Table comparing ancient scripts The Earth's seasons 19th-century mining machine Tawny owl, historical artwork Apollonius of Perga, Greek mathematician Detail of 16th century map of Liguria Conrad Gessner's nature collection Pelvis bones and ligaments 19th Century Electric Telegraph Equipment Sir Isaac Newton, British physicist Tongue anatomy Guillaume Lemonnier1717-1799 Umbrella bamboo (Fargesia murielae) 19th century chart of ocean currents The four humours, diagram Paracelsus and the Basel tribunal Snow crystals Little stint, historical artwork Page 1 Page 3