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To reduce electrolytic corrosion of underground pipes and metallic structures, most tram lines are operated with the wire positive with respect to the rails. Trolleybuses, on the other hand, must use two trolley poles and dual overhead wires, one pole and wire for the positive "live" current, the other for the negative or neutral return.
Flagpoles are usually made of wood or metal. Flagpoles can be designed in one piece with a taper (typically a steel taper or a Greek entasis taper), [2] or be made from multiple pieces to make them able to expand.
Non-wood poles; There are three main non-wood pole materials and structures on which the attachment hardware may be mounted: concrete, steel, and fiber-reinforced composite (FRC). Each material has intrinsic characteristics that need to be considered during the design and manufacture of the attachment hardware. Concrete poles
Inglefield clips, from a Royal Navy handbook of 1943 Two brass Inglefield clips connected (a standard clip on the left and a swivel clip on the right).. The Inglefield clip (also known as a sister clip [1] and a Brummel hook [2]) is a clip for joining a flag or ensign quickly, easily and securely to flag halyards so that the flag can be hoisted. [3]
This list of flagpoles by height includes completed flagpoles which are either free–standing or supported, excluding the height of any pedestal (plinth), building, or other base platform which may elevate them.
A Fahnestock clip is an early type of spring clamp electrical terminal for connections to bare wires. It is still [ when? ] used in educational electronic kits and teaching laboratories in schools. It is designed to grip a bare wire securely, yet release it with the push of a tab.