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For common tape measurements, the tape used is a steel tape with coefficient of thermal expansion C equal to 0.000,011,6 units per unit length per degree Celsius change. This means that the tape changes length by 1.16 mm per 10 m tape per 10 °C change from the standard temperature of the tape.
A recent reassessment of Stonehenge (c.2500 BC) suggests that the monument was set out by prehistoric surveyors using peg and rope geometry. [3] In the sixth century BC geometric based techniques were used to construct the tunnel of Eupalinos on the island of Samos. [citation needed] Modern technology advanced surveying's accuracy and efficiency.
A typical total station can measure distances up to 1,500 meters (4,900 ft) with an accuracy of about 1.5 millimeters (0.059 in) ± 2 parts per million. [4] Reflectorless total stations can measure distances to any object that is reasonably light in color, up to a few hundred meters.
As is the case with all optical techniques, the interaction of light with the sample for this instruments is not fully understood. This means that measurement errors can occur especially for roughness measurement. [4] [5] Digital Holography: this method provides 3D topography with a similar resolution as interferometry.
For a precision machinist level with 2 mm (0.079 in) divisions, when the vial is tilted one division, the level will change 0.04 mm (0.0016 in) one meter from the pivot point, referred to by machinists as 5 tenths per foot. This terminology is unique to machinists and indicates a length of 5 tenths of 1 thousandth of an inch. [3] [4]
Donald Trump loomed large over the federal courthouse in Washington, DC, last week as people who rioted at the US Capitol on January 6, 2021, to stop the peaceful transfer of power and the judges ...
Only 2.5 percent reported no pain. The pain scores were highest among women who had not given birth. This is not a new phenomenon—studies going back to the 1970s and ’80s have tried to ...
PHOTO: This picture taken on Oct. 12, 2015 shows the C-Lion-1 submarine telecommunications cable being laid to the bottom of the Baltic Sea by a cable laying ship off the shore of Helsinki, Finland.