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The rod is useful as a unit of length because integer multiples of it can form one acre of square measure (area). The 'perfect acre' [ 2 ] is a rectangular area of 43,560 square feet, bounded by sides 660 feet (a furlong ) long and 66 feet (a chain ) wide (220 yards by 22 yards) or, equivalently, 40 rods by 4 rods.
These bars often used a unit of measure called a rod, of length equal to 5.5 yards, 5.0292 metres, 16.5 feet, or 1 ⁄ 320 of a statute mile. [23] A rod is the same length as a perch or a pole. [24] In Old English, the term lug is also used.
Each revolution of the wheel measures a specific distance, such as a yard, meter or half-rod. Thus counting revolutions with a mechanical device attached to the wheel measures the distance directly. Surveyor's wheels will provide a measure of good accuracy on a smooth surface, such as pavement.
Surveyor's view of the levelling rod with the crosshair. This indicates a reading of 1.422 m, interpolated between the 1.420 m and 1.430 m marks. Rods come in two classes: Self-reading rods (sometimes called speaking rods). Target rods. Self-reading rods are rods that are read by the person viewing the rod through the telescope of the instrument.
A quarter chain, or 25 links, measures 16 feet 6 inches (5.03 m) and thus measures a rod (or pole). Ten chains measure a furlong and 80 chains measure a statute mile. [1] Gunter's chain reconciled two seemingly incompatible systems: the traditional English land measurements, based on the number four, and decimals based on the number 10.
Stadia marks on a crosshair while viewing a metric levelling rod. The top mark is at 1.500 m and the lower is at 1.345 m. The difference between the rod readings is 0.155 m, yielding a distance to the rod of 15.5 m. A typical surveyor's instrument reticle has two pairs of stadia marks. One pair are on the horizontal centreline and the other on ...