﻿Smithsonian 
  Report, 
  1929. 
  — 
  Compton 
  

  

  PLATE 
  4 
  

  

  2. 
  Recoil 
  electrons. 
  The 
  

   X 
  RAYS 
  ARE 
  Going 
  from 
  Left 
  

   TO 
  Right 
  and 
  the 
  Shorter 
  

   Tracks 
  Proceed 
  almost 
  in 
  

   THE 
  Direction 
  of 
  the 
  X 
  rays 
  

  

  ^30' 
  

  

  TdO 
  

  

  1. 
  SPECTRA 
  OF 
  SCATTERED 
  X 
  RAYS 
  

  

  (BELOW) 
  Compared 
  with 
  the 
  

  

  SPECTRUM 
  OF 
  THE 
  ORIGINAL 
  X 
  RAY 
  

  

  