Encyclopædia Britannica: A New Survey of Universal Knowledge, Том 21

absorption Afrikaner America amplitude Aragon army atoms Barcelona became British Cape Cape colony Cape Town Castile Catalan Catalonia central centre century chief choanocytes church civil coast coastal colony colour consists cord Cortes developed diaphragm eastern effect electrical electrons energy excited force French frequency important Inca increased industries intensity islands king known land Laplace's equation later light lines London Madrid measured ment motion native northern observed officers operations organization period photographic plate political population prism produced province radiation reflex region resonance result river slit sound sound-waves South Africa southern Spain Spanish Sparta species spectra spectral lines spectroscopic spectrum spicules spiders spinal Spinoza Spitsbergen sponges sq.mi staff stars surface temperature theory tion town Transvaal tube Union United velocity vibrations Visigothic wave lengths