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The best heating element for an electrically heated table - and the one I am using in this manual - is carbon or infrared heating film. These very thin heating foils are primarily meant for electric floor and wall heating in buildings and vehicles, for protecting batteries or water tanks against the cold, or for warming beehives and terrariums. Infrared heating films are low-temperature, large-surface heaters, so there’s no risk of burns or fire through direct contact with skin or clothes. They are meant to operate at a maximum temperature of 40-45°C (104-113°F).

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References:

• Knots, ties and splices (1884)
• Knots, splices and rope work: a practical treatise (1917)
• The use of ropes and tackle (1922)
• The Ashley Book of Knots (1944)
• Knot charts (pdf)
• International Guild of Knot Tyers.
• Splicing wire ropes: 1 & 2.
• Also of interest: History and Science of Knots, JC Turner & P van de Griend (1996). Free access in some libraries