﻿Smithsonian 
  Report, 
  1929. 
  — 
  Lewton 
  

  

  Plate 
  6 
  

  

  Original 
  Model 
  of 
  United 
  States 
  patent 
  No. 
  8294, 
  Issued 
  to 
  Isaac 
  m. 
  

   Singer, 
  august 
  12, 
  1851 
  

  

  