What is the level employee?
level employees are a measuring rod that the ground inspectors supervised by a telescope to calculate the slope or difference at an altitude between two places. Whatever their material construction, most models can be treated in height, whether telescopically or with other side attachments. It is also called a leveling rod, its use is based on one of the simplest principles of geometry.
They may be the only long rod, but soil survey requires some portability. Lightweight staff at aluminum level can have nested sections that binoculars out and locked to set the height. Wooden types can be made in separate sections that combine end-to-end and lock as needed. They all completed numeric signs, either imperial or metric measurements, in a large, visible press. They are basically a very long rulers with a functional resolution of about 0.1 inches (2.5 mm).
In addition, there are two different types of employees at a level that corresponds to thatwho measured measurements. "Target Rod" reads Rodman, the individual holds the employee of the level. Another type, "self -service rod", is read by an instrument. The latter, sometimes called the "speaking pole", is seen and recorded by an individual who looks at a telescope mounted on a tripod from a distance.
The target rods are mounted with a sliding target, which is marked with a cross and is cut with a keyhole in the center. With manual signals or radio, the man orders Rodman to slide the target up or down until his threads match the hybrid in his telescope. These are also sometimes called stadium brands.
There are several other employees at a level that are different for specialized applications. The Topograph has a zero mark in the middle and is useful for continuous recording pluses and minuses wildly undulating heights. The so -called rods Standia are excessive versions of level employeesused for longer distances.
Measurement geometry is quite simple. The observation tool used by most inspectors is called theodolite and the adjustable legs of its tripod holder can be adjusted to ensure that the telescopic view is really at the level. Its height above the ground is recorded.
A practical distance of up to 410 feet (125 m) for most models is monitored by vertical level staff, which records measurements marked with the cross wings of the telescope. The difference between two measurements is a height change. If the exact distance is also recorded, the simple calculation of triangulation brings the measurement of a change in increases in degrees or inclinations.