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planimeter    
n. 测面器,求积计

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  • ACME Planimeter
    Click on the map to place points Place at least two points and the perimeter length will be computed Place at least three points and the enclosed area will be computed The page remembers your most recent position zoom map-type for the next time you visit
  • Planimeter - Wikipedia
    A planimeter, also known as a platometer, is a measuring instrument used to determine the area of an arbitrary two-dimensional shape There are several kinds of planimeters, but all operate in a similar way
  • How Planimeters Work - Wabash College
    Planimeters work based on the intuitive notion of a moving line segment sweeping out area Here is a line segment sweeping out a narrow quadrilateral The segment is oriented by a vector N, which is normal, or perpendicular, to the segment The area swept out is signed, or oriented The positive direction is indicated by N
  • Planimeter | Surveying, Measurement, Calculation | Britannica
    planimeter, mathematical instrument for directly measuring the area bounded by an irregular curve, and hence the value of a definite integral The first such instrument, employing a disk-and-wheel principle to integrate, was invented in 1814 by J H Hermann, a Bavarian engineer
  • How to Use Planimeter in Surveying? Components of a . . .
    Planimeter is used to compute the area of given plan of any shape In the first step anchor point is to be fixed at one point If the given plan area is small, then anchor point is placed outside the plan Similarly, if the given plan area is large then it is placed inside the plan
  • The Planimeter and the Theorem of Green - Harvard University
    The polar planimeter is a mechanical device for measuring areas of regions in the plane which are bounded by smooth boundaries The measurement is based directly on Green's theorem in multi-variable calculus: the planimeter integrates a line integral of a vector field which has constant curl
  • Planimeter: Meaning, types, usage and accuracy - Housing. com
    What is planimeter and how is it used? A planimeter is an instrument for measuring areas, usually the areas of irregular regions on a map





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