Crates, as shown on [fig. 80], are constructed of oak with iron bindings. They will carry a weight of 1,500 lbs. and hold 350 bricks. They can be filled in the builder’s yard and transferred direct to the working platform without disturbing the material, which, for saving time, is often of great advantage. The absence of sides facilitates loading, but on the other hand, if any materials, say bricks, are put in loosely, they may fall out during transference, causing danger to the workmen.
When used to carry rubble work which cannot be stacked, it is better that sides should be fitted.
When used to carry a roll of lead, a stay should be placed, as shown by dotted line on figure. This will prevent the crate buckling at the bottom.
These crates are sometimes fitted with wheels to run on rails.
Ashlar Shears.—The shears (figs. [81] and [82]) are useful for lifting dressed work, the points fitting into small holes which have been cut out for their reception in the ends or sides of the stone. There is danger in their use if the points drag upwards and outwards. To prevent this as far as possible, the holes should be cut low, but not below the centre of gravity of the stone, or else it would turn over and perhaps fall.
Fig. 81
Fig. 82
[Fig. 82] is a bad form of shears, as, owing to the sharp curve, the points can only clutch near the top of the stone.