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FS Lec 2

QuestionAnswer
What is the historical definition of a 'Cubit'? The distance from the tip of a man's middle finger to the point of his elbow (approximately 18 inches).
How is the human-based dimension 'Fathom' defined? The distance between the tips of a man's middle fingers when his arms are outstretched (approximately 6 feet).
Where and when was the Metric System originally developed? It was developed in France in the 1790s.
In what year did the U.S. Congress legalize the use of the Metric System? 1866
What event in 1983 defined the present value of a meter? The meter was defined as the distance traveled by light in 1/229,792,458 seconds.
How did the 1959 change in the foot-to-meter standard affect surveying types differently? The difference is not significant for plane surveys but does affect geodetic surveys.
What is the total length and composition of a Gunter's Chain? It is 66 feet long and composed of 100 links.
What is the primary function of an odometer in surveying? It converts wheel revolutions to distance.
What is the estimated accuracy of an odometer or measuring wheel? Approximately 1/200 of the distance measured.
What is 'Invar' in the context of surveying equipment? An alloy of steel and nickel used for high-precision tapes.
What is the typical error percentage associated with taping? 0.1% of the distance measured.
Term: Tacheometry Definition: Any rapid method of indirectly measuring horizontal distances, such as using Stadia measurements.
What is the formula for calculating distance using Stadia measurements? Distance = 100(TSR - BSR) where TSR is the top stadia reading and BSR is the bottom stadia reading.
In taping, what is the purpose of using a plumb bob? To project tape graduations from a height accurately to a point on the ground.
List three common systematic errors in taping. Incorrect length of tape, tape not horizontal, and sag in the tape.
Concept: Normal Tension Definition: The tension applied to a tape to compensate for the shortening effect of sag
In taping, what defines 'Incorrect alignment' as a systematic error? The tape not being held in a straight line between the two points being measured.
How does tape support affect measurement accuracy? A tape supported throughout its length yields a different value than a tape supported only at the ends, even under identical tension.
Created by: Phillies55
 

 



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