Atomic Theory - Essay
1873 James Clerk Maxwell Proposed electric and magnetic fields filled the void.
1879 Sir William Crookes Discovered cathode rays had the following properties: travel in straight lines from the cathode; cause glass to fluoresce; impart a negative charge to objects they strike; are deflected by electric fields and magnets to suggest a negative charge; cause pinwheels in their path to spin indicating they have mass.
1886 E. Goldstein Used a CRT to study "canal rays" which had electrical and magnetic properties opposite of an electron.
1894 G.J. Stoney Proposed that electricity was made of discrete negative particles he called electrons ". (Link to info on electrons)
1895 Wilhelm Roentgen Using a CRT he observed that nearby chemicals glowed. Further experiments found very penetrating rays coming from the CRT that were not deflected by a magnetic field. He named them "X-rays".
1896 Henri Becquerel While studying the effect of x-rays on photographic film, he discovered some chemicals spontaneously decompose and give off very penetrating rays.
1897 J.J. Thomson Used a CRT to experimentally determine the charge to mass ratio (e/m) of an electron =1.759 x 10 8 coulombs/gram.
1897 J.J. Thomson Studied "canal