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American Chain American Standards Association angle Annual rings attached beam belt bending boatswain's chair bolts boom bracing cause cent Chain & Cable chain hoist color compression failure compression wood Consolidated Edison construction crane cross grain decay defects derrick diagonal grain diameter dip grain Douglas fir drum EASTERN HEMLOCK edge Elevators extension ladder factor of safety fibers floor Heartwood hitch hook horizontal indicated inspection jack knot lb per sq length lens lift longleaf pine lower manila rope Names of publications operator outrigger overloading placed poles pores Procure pull radial Rays reddish brown reef knot resin ducts rigger rigging rung safe load Sapwood scaffold planks sheave shown in Fig side rails Sitka spruce sling socket span spiral grain splice springwood spruce stack steel strands strength stress structural summerwood Table Tangential surface timber usually weight wide width winch wire rope Wood moderately heavy