The boat is slung from a single needle. The workman has no control over its movement, as he has to be raised or lowered as required by men having charge of the other end of the fall.
Fig. 43
Fig. 44
Fig. 45
Fig. 46
Ladder scaffolds.—A light scaffold of ladders braced, and connected by rails, which also serve the purpose of guard rails, is shown in [fig. 43]. The ladders, which have parallel sides, are placed about 2 feet away from the building. The boards forming the platform can be laid on the ladder rungs, or if necessary on brackets as shown in [fig. 44]. The ladders are prevented from falling away from the building by ties which are connected to the ladder as shown in [fig. 45], and fastened to the window openings by extension rods as shown in [fig. 46]. The same figure illustrates the method of tying in the scaffold when the ladders are not opposite to the windows, the rail A being connected to at least two ladders. The braces and guard rails are bored for thumb screws at one end, the other being slotted so that they can be adjusted as required. This form of scaffold is only suitable for repairing purposes, and no weight of material can be stored upon it.