Glossary H
Hoist refers to a suspended machinery unit that is used for lifting and lowering a freely suspended (unguided) load; can be powered by hand, air or electricity; lifting medium either chain, wire rope or roller chain.
Hand-operated is described as requiring hand manipulation for operation ; not automatic or machine-driven; as, a hand-operated winch. The term hand operated is the opposite of automatic or powered. Examples of hand operated machines, devices or equipments are: arbor press which is a hand-operated machine tool, hand-operated grinder to grind meats used by chefs and cooks
Heat pump (as used in geothermal industry) in which the refrigerant exchanges heat in a heat exchanger with a fluid circulating through an earth connection medium - ground or ground water. The fluid is contained in a variety of loop/pipes configurations depending on the temperature of the ground and the ground area available. Loops may be installed horizontally or vertically in the ground or submersed in a body of water.
Horizontal classification means a grouping of species from a similar time interval of evolution rather than those sharing a common lineage (horizontal with respect to a phylogenetic tree). Compare --->'vertical classification'.