page_title: Lewis (lifting appliance)
hierarchical_section_title: Lewis (lifting appliance)
caption_attribution_description: A Lewis (lifting appliance) used by stonemasons.
context_page_description: A lewis is one of a category of lifting devices used by stonemasons to lift large stones into place with a crane, chain block, or winch. It is inserted into a specially prepared hole, or seating, in the top of a stone, preferably above its centre of mass. It works by applying principles of the lever and utilises the weight of the stone to act on the long lever-arms which in turn results in a very high reaction force and friction where the short lever-arms make contact with the stone inside the hole and thereby prevents slipping.
context_section_description: A lewis (sometimes called a lewisson) is one of a category of lifting devices used by stonemasons to lift large stones into place with a crane, chain block, or winch. It is inserted into a specially prepared hole, or seating, in the top of a stone, preferably above its centre of mass. It works by applying principles of the lever and utilises the weight of the stone to act on the long lever-arms which in turn results in a very high reaction force and friction where the short lever-arms make contact with the stone inside the hole and thereby prevents slipping.
caption: Lewises in a stonemasonry workshop
exif: {"Image Make": "SONY", "Image Model": "DCR-TRV33E", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image DateTime": "2006:06:27 23:30:29", "Image YCbCrPositioning": "Co-sited", "Image ExifOffset": "212", "Image CustomRendered": "Normal", "Image ExposureMode": "Auto Exposure", "Image WhiteBalance": "Auto", "Image SceneCaptureType": "Standard", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail Make": "SONY", "Thumbnail Model": "DCR-TRV33E", "Thumbnail Orientation": "Horizontal (normal)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail DateTime": "2006:06:27 23:30:29", "Thumbnail JPEGInterchangeFormat": "738", "Thumbnail JPEGInterchangeFormatLength": "6223", "Thumbnail YCbCrPositioning": "Co-sited", "EXIF ExposureTime": "1/100", "EXIF FNumber": "12/5", "EXIF ExposureProgram": "Program Normal", "EXIF ExifVersion": "0220", "EXIF DateTimeOriginal": "2006:06:27 23:30:29", "EXIF DateTimeDigitized": "2006:06:27 23:30:29", "EXIF ComponentsConfiguration": "YCbCr", "EXIF CompressedBitsPerPixel": "2", "EXIF ExposureBiasValue": "0", "EXIF MaxApertureValue": "17/10", "EXIF MeteringMode": "Pattern", "EXIF LightSource": "Unknown", "EXIF Flash": "No flash function", "EXIF FocalLength": "37/10", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "480", "EXIF ExifImageLength": "640", "EXIF FileSource": "Digital Camera", "EXIF SceneType": "Directly Photographed"}