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American Chain American Standards Association angle annual ring attached beam belt bending block boatswain's chair bolts boom cause cent chain hoist compression failure Consolidated Edison construction crane cross grain defects derrick diameter dip grain Douglas fir drum edge Engineering erected eye splice eyebolt factor of safety fibers Flemish eye floor ground Handbook Heartwood hitch hook horizontal indicated inspection installed jack knot lb per sq length lens lift lower manila rope moderately light operator outrigger overloading piece pine pipe Pith placed pole pores pull putlog radial Rays reddish brown reef knot resin ducts rigger rigging rolling hitch rung safe load Sapwood scaffold planks sheave shown in Fig side rails Sitka spruce sling socket span spiral grain springwood spruce stack steel strands strength stress structural summerwood Table timber usually vertical weight wide width winch wire rope Wood moderately heavy