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Patent No. US9910286B2 Twinscope 3-D viewer - Inventor: Colleen Woolpert 
2015 
  
Patent illustration 
US Patent Office 
 
LL/106349 
  
A stereoscope is used for viewing a stereographic pair of images that are placed side-by-side on a card or presented on a digital screen. A lens board has left and right apertures defining a horizontal base line. A pair of prismatic lenses are fitted into the left and right apertures, respectively. A stem or handle projects from the lens board in the plane of the lens board midway between the apertures and perpendicular to the base line. A removable opaque synthetic rubber hood is fitted onto the lens board and has eye covers of generally tubular shape. 
 

 
  
 
  
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