CN2859446Y - Map measurer - Google Patents

Abstract

A map measurer comprising of scalene triangle(1) which is characterized in that said scalene triangle(1) is joined with a protractor (2) on the bevel edge near the short right angle edge, and joined a inner triangle(3) on the other end of scalene triangle(1). Hence, it has simple structure, is operated conveniently, has extensive use, can improve the measure accuracy, especially suit for map measurement and mapping on land measure drawing sheet.

Description

Map measurer

Affiliated technical field:

The utility model relates to a kind of surveying instrument, particularly a kind ofly the surveying instrument of mapping paper.

Background technology:

At present domestic used drawing surveying instrument is commonly used set square and protractor.Set square is divided into two kinds, and a kind of is right angle inequilateral set square, and a kind of is equilateral triangle plate (center is furnished with protractor).The straight flange of independent protractor often has rule.When drawing is measured the length of line segment and orientation, remove special line segment, generally adopt set square and protractor to be used, the protractor that has the length scale as employing also needed for two steps, also needed simultaneously to do boost line with pencil.Working routine is comparatively complicated like this, and how step certainly will increase systematic error, easily causes former figure to damage simultaneously.

Summary of the invention:

The purpose of this utility model is to provide a kind of simple in structure, easy to use, easy to operate, of many uses, map measurer that can improve accuracy of measurement.

The purpose of this utility model is achieved in that a kind of map measurer, is made up of scalene triangle (1), it is characterized in that described scalene triangle (1) is connected with protractor (2) near the hypotenuse of short straight flange, and is connected with interior triangle (3) at the other end.

Preferred plan of the utility model: all there is the length scale on three limits of scalene triangle (1), and its hypotenuse is as the reference edge of protractor (2).

The utility model compared with prior art has the following advantages: owing to adopt scalene triangle (1) to be connected with protractor (2) near the hypotenuse of short straight flange, and be connected with interior triangle (3) at the other end, thereby simple in structure, easy to operate, of many uses, can improve the accuracy of measuring.

Description of drawings:

Figure: be the utility model concrete structure synoptic diagram.

1, inequilateral set square; 2, protractor; 3, interior triangle.

Embodiment:

With scalene triangle (1) is template, is material with the transparent plastic, adds the length scale at the set square hypotenuse, near the short right-angle side of inequilateral set square, engraves angle index at the plate face, and angle index reference edge and set square hypotenuse coincide.Still keep simultaneously triangle (3) in the set square, only suitably adjust its ratio.

When measuring the length of a line segment and orientation, utilize the length scale of the hypotenuse of novel measuring appliance to measure its length, moving of the hypotenuse section along the line by novel measuring appliance makes the angle index central point overlap with the Building X graticule, can measure the orientation of this line segment.Make during the plotting measurement point and measure initial point on the hypotenuse of novel measuring appliance, move angle scale central point 0 on the parameter of Building X is aimed at its known formula parallactic angle and can be drawn the machine plotting direction.

Claims (2)

1, a kind of map measurer is made up of scalene triangle (1), it is characterized in that being connected with protractor (2) on the hypotenuse of described scalene triangle (1) near short right-angle side, and in its other end connects triangle (3).

2, map measurer according to claim 1 it is characterized in that all there is the length scale on three limits of described scalene triangle (1), and its hypotenuse is as the reference edge of protractor (2).

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