Collier's Encyclopedia: With Bibliography and Index, Volume 9

acid alloys American amplifier anode atoms basic beam became called carbon cathode cells century B.C. chalcogens characteristics chemical Christian Church circuits common complex compounds cylinder diode early elec electrical Electron configuration electron microscope elements elephant Elizabeth enamel energy engine England English enzymes epic Eritrea Eskimo essay ethics Ethiopia Etruscan example fluorine French frequency genes germ layers gram Greek grid halides halogens heat Henry human hydrogen important increase industry integrated circuits iron kilocalories king known land literary Massawa material ment metal meters miles military modern moral nature organic oxide oxygen Parliament percent period plate poems poet poetry population potential produced properties Río Muni River Roman signal social specimen steel structure sulfur temperature tion transistor transmission electron microscope triode trons tube United vacuum tube voltage zinc