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The link (usually abbreviated as "l.", "li." or "lnk."), sometimes called a Gunter’s link, is a unit of length formerly used in many English-speaking countries. In US customary units modern definition, the link is exactly 66 ⁄ 100 of a US survey foot , [ 1 ] or exactly 7.92 inches or 20.1168 cm.
The rod, perch, or pole (sometimes also lug) is a surveyor's tool [1] and unit of length of various historical definitions. In British imperial and US customary units, it is defined as 16 + 1 ⁄ 2 feet, equal to exactly 1 ⁄ 320 of a mile, or 5 + 1 ⁄ 2 yards (a quarter of a surveyor's chain), and is exactly 5.0292 meters.
Surveying prism pole with instrument attached. In surveying, a pole is bar made of wood or metal and normally held vertical, upon which different instruments can be mounted: a prism, a GPS device, etc. [1] It may be manufactured with a predetermined length (e.g., 2 meters) or may be graduated for different heights or stages.
Each survey consists of approximately 1,000 completed interviews among U.S. adults using a sample selected from YouGov’s opt-in online panel of all 50 states plus the District of Columbia to match the demographics and other characteristics of the adult U.S. population.
Common surveying measures in Kentucky include acre and the survey foot, which are both now referenced in decimal and historically in fraction. For example, a modern survey should list a distance of one-foot and six-inches as 1.50 feet. Historically lengths were also measured as chain and rod. A rod is also known as a pole, both being 16.5 feet.
A two-man team would survey what became the District of Columbia in 1791. The first was Benjamin Banneker, a free ex-slave, who learned to read, write, and do the math from his grandmother. Banneker would go on to be a leading astronomer, mathematician, clockmaker, and most of all, a surveyor. The second man was Andrew Ellicott.
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On the front of the rod the graduation increasing from zero at the bottom. On the back of the rod the graduation decrease from 13.09 ft at the bottom to 7 ft. The division of the device in two sliding sections are devised for ease of transport. Readings of 7 ft (2.1 m) or less, and up to 13 ft (4.0 m), can be measured.