Alidade

The alidade (alidade, the Japanese name: 示方規) is an apparatus to use for a plane table and puts it on the flat board and uses it though I look at the aim point and decide a direction.

Table of contents

Summary

There is a compartmentation scale, and a woodenness ruler of around 25cm be accompanied with a collimation board at the pole which I put up with the aim on 測板, and, as for the alidade, a collimation hole, pinnule, collimation thread, foresight associate board of .3 places of rulers is an apparatus to plot the distance to the aim point that measured a direction, a slant with fate, a tape measure by an appointed reduced scale in the on the chart. In addition, a map can demand distance, a pitch difference on the flat board indirectly.

Structure

Pinnule

The center draw it, and there are three places of collimation holes to the drawer board, and a constant scale is touched. In addition, what I can draw is because collimation enables even a state of an angle of declination, the gun elevation of the aim.

Previous collimation board

I collimate a sign through a collimation thread in a rectangular frame. A similar scale is added to pinnule and can find a pitch difference and distance.

Ruler

The ruler of the reduced scale scale is attached to the slope of the main body and can change these scales again, and the on the chart can plot the distance that I measured with a tape measure by attaching reduced scale scales such as 1.300-100ths part .500 part immediately.

Characteristic

The precision is inferior in the indirect leveling, distance surveying, but it is necessary to use properly appropriately while considering precision in map-making quickly in the mountains because surveying is possible.

Allied item

• Surveying
  • Leveling
  • I survey studio dia

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This article is taken from the Japanese Wikipedia Alidade

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