page_title: Cataract (beam engine)
hierarchical_section_title: Cataract (beam engine)
caption_attribution_description: Newcomen engine at the Elsecar Heritage Centre, Elsecar, Barnsley in South Yorkshire
context_page_description: A cataract was a speed governing device used for early single-acting beam engines, particularly atmospheric engines and Cornish engines.
  The cataract is distinctly different from the centrifugal governor, in that it does not control the speed of the engine's stroke, but rather the timing between strokes.
context_section_description: A cataract was a speed governing device used for early single-acting beam engines, particularly atmospheric engines and Cornish engines.
  The cataract is distinctly different from the centrifugal governor, in that it does not control the speed of the engine's stroke, but rather the timing between strokes.
caption: Bottom chamber[1] of the Elsecar Engine
exif: {"Image Orientation": "Horizontal (normal)", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "Adobe Photoshop CS2 Windows", "Image DateTime": "2008:12:17 20:31:41", "Image ExifOffset": "164", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "302", "Thumbnail JPEGInterchangeFormatLength": "6458", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "427", "EXIF ExifImageLength": "640"}