The side or splayed pieces of the lewis shown on [fig. 87] are fitted first, and the centre piece last. A bolt through the top fixes their position and also the ring by which it is to be lifted.
Care should be taken that the sides of the second class of lewis fit accurately, for if they fit as [fig. 88] they may flush the edge and break out, or if they fit as [fig. 89] the risk of fracture, as in the first class, presents itself. In any case there is always a danger of mishaps occurring, especially where the stone is not free from vents.
Their use with safety can only be left to the judgment of the mason.
Stone Cramps.—The cramps tighten on the stone by means of a screw thread, as shown on [fig. 90].
Fig. 90
They are useful for lifting light finished work. Packing should be placed at AA to prevent damage.
The ring by which it is slung is movable to preserve equilibrium.
Wire and Chain Scaffold Lashings.—Wire rope scaffold lashings are now to be obtained for use in place of fibre cords. They are made in lengths from 12 to 18 feet, and are fitted at one end with an eyelet. In fixing, they commence with a clove hitch, the knot being continued as with a fibre cord until near the end, when the lash is taken through the eyelet (see [fig. 91]) and finished with jamming turns.
