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English: This is a drawing of Saint Peter's keys, a device to lift stone blocks. It is also known as a "Roman three-legged lewis", "three-legged lewis", "Wilson bolt", and "dovetailed lewis".

The entire thing fits into a dovetailed seating in the top of a building stone. It is made from three pieces of rectangular-section 13 mm-thick steel (legs) held together with a shackle, allowing connection to a lifting hook. The middle leg is square throughout its length. The outer legs are thinner at the top, flaring towards the bottom. Held together, the three legs form a dovetail shape. The lewis hole seating is undercut (similar to a chain-linked lewis hole) to match its profile.

The first outer leg is inserted into the lewis hole, followed by the second outer leg. The inner (parallel) leg is inserted last, pushing the outer legs into contact with the inside of the lewis hole. The shackle is unbolted, placed over the legs, and the bolt fastened through both the shackle eyes and the eye in the top of each leg.
Nederlands: Een tekening van een steenwolf, een werktuig om steenblokken mee te hijsen
Date
Source Own work
Author Satrughna02

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13 June 2009

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Date/TimeThumbnailDimensionsUserComment
current18:35, 21 October 2010Thumbnail for version as of 18:35, 21 October 20102,272 × 1,888 (903 KB)Satrughnaresolution
19:13, 20 July 2009Thumbnail for version as of 19:13, 20 July 2009692 × 601 (113 KB)Satrughna02extended legs
18:34, 20 July 2009Thumbnail for version as of 18:34, 20 July 2009720 × 629 (140 KB)Satrughna02redrawing entire image
13:24, 13 June 2009Thumbnail for version as of 13:24, 13 June 2009777 × 560 (178 KB)Satrughna02{{Information |Description={{en|1=a drawing of Saint Peter's keys, a device to lift stone blocks}} {{nl|1=Een tekening van een steenwolf, een werktuig om steenblokken mee te hijsen}} |Source=Own work by uploader |Author=Satrughna02 |D

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