﻿Smithsonian 
  Report, 
  1943.— 
  Abbot 
  

  

  Plate 
  2 
  

  

  Diaphragm 
  Pump 
  Injector 
  of 
  Variable 
  Throw 
  Governed 
  by 
  Differential 
  

  

  Heat 
  Expansion 
  Between 
  Boiler 
  and 
  Invar 
  Tape. 
  

  

  Rollers 
  which 
  support 
  the 
  mirror 
  seen 
  behind 
  the 
  aluminum 
  plate. 
  

  

  