Plumb-Bob : Special tool used to establish the outward lean or slant of a tree in relation to its base. Generally a lead weight attached to piece of string is used
US Department of Labor, Logging eTool: Glossary, Occupational Safety & Health Administration OSHA, Washington, D.C., USA 2010. https://www.osha.gov/SLTC/etools/logging/glossary. html, (OSHA/ Logging - Amer) {620}