Radium, and other radio-active substances: polonium, actinium, and thorium. With a consideration of phosphorescent and fluorescent substances, the properties and applications of selenium, and the treatment of disease by the ultra-violet light
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actinium aluminum apparatus arc lamp arc light barium barium chloride battery beam of light black paper blue bulb buoy carbon cathode rays caused Chap chemical chloride circuit cloth color connected copper Curie deviable discovery disease disk effect Electrical Engineering electrodes electroscope emanations employed experiments exposed exposure Finsen Institute fish flame fluorescent Giltay glass gramme heat Henri Becquerel Heydweiller Illustrated induction coil investigations iron J. J. Thomson lens Lord Kelvin luminous paint Lupus Vulgaris magnets Mercadier metallic mica motor penetration phenomena phosphorescent phosphorescent substances phosphorus pitchblende placed polonium possess produced Prof radiations radioactive substances radioactivity Radiograph radiometer radiophone radium rays resistance Roentgen rays Rutherford sample screen selenium cell shown speaking arc sulphide of calcium sunlight surface telephone temperature thermit thick thorium tiny transmitter treatment tube containing tubes of radium tungstate of calcium ultra-violet light ultra-violet rays uraninite uranium wire writer X-rays