JP3070567U - Globe ruler - Google Patents

Abstract

(57) [Problem] To provide a globe ruler that can easily measure the distance between two points on the surface of a globe. SOLUTION: This globe ruler has a scale edge concavely curved along a surface of a corresponding globe.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 This invention relates to a globe ruler, which is used to measure the distance and find the direction on the surface of the globe.

[0002]

[Prior art]

 You may be looking at a globe and want to know the distance from, for example, Tokyo (Japan) to Los Angeles (USA). In this case, since the surface of the globe is a curved surface, it cannot be measured with an ordinary ruler. Therefore, align one end of the thread with one (Tokyo) and extend it along the curved surface while marking it at a location corresponding to the position of the other (Los Angeles). Then, the distance between the two yarns was measured by measuring the length of the yarn with a conventional straight ruler (a ruler having a linear scale edge).

[0003]

[Problems to be solved by the invention]

 However, in such a conventional measuring method, the length between the two must be obtained with a yarn, and then the length of the yarn must be measured with a linear ruler. As a result, there was a disadvantage that the distance could not be easily measured on the surface of the globe.

[0004] The problem of the present invention is to eliminate these disadvantages.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, in the globe ruler according to the present invention, the scale edge is concavely curved along the surface of the corresponding globe, so that the scale edge of the ruler can be substantially along the surface of the globe without any gap. You can do it.

Further, if this ruler is used, the distance can be easily obtained and the direction thereof can be obtained at the same time.

[0007]

[Embodiment of the invention]

 FIG. 1 is a perspective view of the globe ruler according to the present invention, and FIG.

In FIG. 1, reference numeral 10 denotes a globe ruler according to the present invention, and 11 denotes a ruler body. The ruler main body 11 is prepared by cutting two pieces of cardboard into a substantially crescent shape and bonding them together. Reference numeral 12 denotes a scale edge, which is formed on an inner peripheral edge of the ruler main body 11. The scale edge 12 is concavely carved along the surface of the globe E to be used by the globe ruler 10. Therefore, when the globe ruler 10 is brought into contact with the corresponding globe E, the graduation edge 12 can contact the surface of the globe E with almost no gap. Further, a scale 13 having a width of 1000 km and a width of 1 cm based on the scale of the globe E was written on the scale edge 12. Further, decorations 14, 14,... Of buildings, pyramids, trees, ships, etc. were cut out from the cardboard on the outer peripheral side of the ruler body 11, sandwiched between the pair of substantially crescent-shaped cardboards, and bonded and fixed. In this way, an earth-like image was created. The globe ruler 10 is manufactured entirely from cardboard, but can be manufactured using any plate material such as a synthetic resin plate or a metal plate.

Next, in FIG. 2, C indicates China, R indicates Russia, A indicates the United States, M indicates Mexico, J indicates Japan, T indicates Tokyo, and N indicates the location of New Guinea Island.

A method of using the globe ruler will be described with reference to FIG. For example, when measuring the distance from Los Angeles in the United States to Tokyo in Japan, first set the scale “0” of the earth ruler 10 to Los Angeles L as shown in FIG. Then, point the other end of the ruler in the direction of Tokyo and contact the curved surface of the globe E without any gap, and read the scale at the position of Tokyo T. Then you can easily find the approximate shortest distance and shortest direction. In the meantime, to go to Turkey (not shown) from Japan J, it was thought that the shortest direction had been to pass through China C until now. It turned out that the shortest direction was passing through an upwardly convex curve.

[0011]

[Effect of the invention]

 In the globe ruler according to the present invention, since the scale edge is concavely curved along the surface of the corresponding globe, the scale edge of the ruler can be made to follow the surface of the globe almost without gaps.

[0012] Therefore, if this globe ruler is used, the distance between two points can be measured immediately just by applying the ruler to the surface of the globe, so that the distance can be easily measured on the surface of the globe unlike the related art. Things.

Further, if this ruler is used, the distance can be easily obtained and the direction thereof can be obtained at the same time.

[Brief description of the drawings]

FIG. 1 is a perspective view of a globe ruler according to the present invention.

FIG. 2 is a diagram showing the state of use.

[Explanation of symbols]

 10… globe ruler 12… scale edge E… globe

Claims (1)

[Utility model registration claims] 2. The globe ruler according to claim 1, wherein the scale edge is concavely curved along the surface of the corresponding globe.