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Qu'est-ce (qui) est Lewisson - définition
LIFTING APPLIANCE
Chain-linked Lewis; Two-pinned Lewis; Three-legged Lewis; Split-pin Lewis; External Lewis; Lewis (Lifting appliance); Lewisson; St. Peter's keys; Lewis hole; Three-legged lewis; External lewis; Slab lifter; Wilson bolt
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![A kerb lifter lifting kerb stones in [[Hainan]], China.](https://commons.wikimedia.org/wiki/Special:FilePath/A lewis in Hainan - 01.jpg?width=200 "A kerb lifter lifting kerb stones in [[Hainan]], China.")
.JPG ?width=200 "A split-pin lewis placed in the top of an altar stone")
![Duomo, Florence]]](https://commons.wikimedia.org/wiki/Special:FilePath/Wilson bolt.jpg?width=200 "Duomo, Florence]]")
Lewisson
·noun A kind of shears used in cropping woolen cloth.
II. Lewisson ·noun An iron dovetailed tenon, made in sections, which can be fitted into a dovetail mortise;
- used in hoisting large stones, ·etc.
Lewis (lifting appliance)
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.
Wikipédia
Lewis (lifting appliance)
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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.
