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Pneumatic systems incorporate a hand pump to pressurize the interior of the mast causing it to rise. Smaller masts and poles, in 20' to 40' range, can be manually extended, locked-in-place by hand, and supported at the top-end with three guy-lines, by a single person; although having two persons involved is easier and safer.
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.
Modern large flags designed to be hand held might be made of lighter silk or nylon and are more resistant to moisture retention. [13] Perhaps even more importantly, the signaling elements in wigwag consist of motions rather than positions as in flag semaphore.
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A US Navy crewman signals the letter 'U' using flag semaphore during an underway replenishment exercise (2005). Flag semaphore (from the Ancient Greek σῆμα (sêma) 'sign' and - φέρω (-phero) '-bearer' [1]) is a semaphore system conveying information at a distance by means of visual signals with hand-held flags, rods, disks, paddles, or occasionally bare or gloved hands.
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.
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