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CHAPTER PAGE I About Locomotive Whistles and Other Things
About Spiders and the Fourth Dimen sion
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actinium alpha rays amount atomic number atomic weight atoms of hydrogen attraction ball body calculate carbon chemical chlorine colors Crookes tube dimensions direction distance earth electrical charge electroscope elements energy entirely ether experiment fact feet formula four frequency give glass going gravitation happen heat helium hook hundred idea imagine inch instance instruments J. J. Thomson jump kind lines magnet mass material mathematics measure miles a second million molecules motion moving nature negative neon lamp notice nucleus number of electrons observe orbit ounces oxygen particles pebble perhaps planes of reference planets plate position possible pounds prism protons radiation radio-active radium rays result scientist seems shell shows slot spectrum speed of light square star strike substance supposed temperature theory things thousand tion train tube uranium vibrations wave length wire