## UNITS OF MEASUREMENT

Units of measurement used in past and present surveys are

For construction work: feet, inches, fractions of inches
(m, mm)

For most surveys: feet, tenths, hundredths, thousandths
(m, mm)

For National Geodetic Survey (NGS) control surveys:
meters, 0.1, 0.01, 0.001 m

The most-used equivalents are

meter = 39.37 in (exactly) = 3.2808 ft

rod = 1 pole = 1 perch = 16 1/2 ft (5.029 m)

engineer s chain = 100 ft = 100 links (30.48 m)

Gunter s chain = 66 ft (20.11 m) = 100
Gunter s links (lk) = 4 rods = 1 ?80 mi (0.020 km)

acre = 100,000 sq (Gunter s) links = 43,560
ft 2 = 160 rods 2 = 10 sq (Gunter s) chains = 4046.87
m 2 = 0.4047 ha

rood = 3/4 acre (1011.5 m 2) = 40 rods 2 (also
local unit = 5 1/2 to 8 yd) (5.029 to 7.315 m)

ha = 10,000 m 2 = 107,639.10 ft 2 = 2.471 acres

arpent = about 0.85 acre, or length of side of
1 square arpent (varies) (about 3439.1 m 2)

statute mi = 5280 ft = 1609.35 m

mi 2 = 640 acres (258.94 ha)

nautical mi (U.S.) = 6080.27 ft = 1853.248 m

fathom = 6 ft (1.829 m)

cubit =...

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Grounding bars and grounding rods are electrical connections that divert undesirable current in order to protect humans and equipment.
Elevators, Escalators, and Moving Walkways
Elevators, escalators and moving walkways are used to raise or move people or goods from one location to another within a building.
Sucker Rods
Sucker rods are used to connect the surface pumping unit to the downhole components of a pumping system in an oil and gas well.
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Purge controllers and purge indicators are used to regulate and monitor hazardous environments within enclosures.
Hones and Honing Tools
Hones and honing tools are abrasive products used to refine the finish of internal bores and external surfaces.

##### Topics of Interest

PHYSICAL PROPERTIES OF SOILS Basic soil properties and parameters can be subdivided into physical, index, and engineering categories. Physical soil properties include density, particle size and...

U. S. Customary units Multiply by SI or US Customary units Length inches (in) 2.540 centimeters (cm) 0.0254 meters (m) feet (ft) 0.3048 m 12 in yard (yd) 0.9144 m 3 ft miles 1.609...

English Multiply by Metric (SI) or English Length inches (in) 2.540 centimeters (cm) 0.0254 meters (m) feet (ft) 0.3048 m 12 in yard (yd) 0.9144 m 3 ft miles 1.609 kilometers (km)...

Length and Area 1 inch (in) = 2.54 centimeters (cm) = 25.4 millimeters (mm) 1 foot (ft) = 12 inches (in) = 30.48 centimeters (cm) 1 yard (yd) = 3 feet (ft) = 0.914 meter (m) 1 mile...

TABLE C.1: Metric Conversion Factors (U.S. Customary Units to SI Units) Multlply the U.S. customary unit To obtain the Sl unit Name Symbol By Symbol Name Acceleration feet per ft/s 2 0.3048 a m/s...

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