File:Wolf2.jpg
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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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I, the copyright holder of this work, hereby publish it under the following licenses:
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. |
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:35, 21 October 2010 | | 2,272 × 1,888 (903 KB) | Satrughna (talk | contribs) | resolution |
| 19:13, 20 July 2009 |  | 692 × 601 (113 KB) | Satrughna02 (talk | contribs) | extended legs | |
| 18:34, 20 July 2009 |  | 720 × 629 (140 KB) | Satrughna02 (talk | contribs) | redrawing entire image | |
| 13:24, 13 June 2009 |  | 777 × 560 (178 KB) | Satrughna02 (talk | contribs) | {{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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