JPS6063412A - Bearing ruler - Google Patents

Abstract

PURPOSE:To make bearing base lines easy to see at measurement when they are matched to longitude and latitude, by setting the center of a bearing plate to a moving plate having a parallel moving parts with a bearing plate attaching shaft and making the bearing plate rotatable to eliminate read error. CONSTITUTION:Upper side faces of a transparent linear ruler 4 are projected to provide moving plate receiving parts 13, and both ends of a moving plate 2 are bent into an L shape to form parallel moving parts 11, and their tips are bent inside slightly, and the center of the bearing plate 1 is set to the center part of a moving plate supporting part 12 by a bearing plate attaching shaft 3 so that the bearing plate 1 can be rotated. A center line 6 is provided in positions coincident with the center of the bearing plate 1 on the linear ruler 4, and a stopper (b) is provided in one end, and a hook hole (c) is provided in the other end, and length graduations 5 and loran time difference graduations (a) are provided in the front part, and true bearing graduations 8 are provided on the outside circumference of the bearing plate 1, and magnetic bearing graduations 7 are provided on the inside of them. Bearing base lines 9 and 10 connecting angles 0 deg. and 180 deg. are angles 90 deg. and 270 deg. are drawn, and the linear ruler and the bearing plate are interlocked with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the measurement of direction and distance on a nautical chart.

Conventionally, when determining the bearing of point A from one's own ship, a triangular ruler was used.The ruler was placed on point A from one's own ship and the ruler was slid parallel to the top of the bearing scale on the nautical chart to show the bearing.Also, when measuring distance, a divider was used. The distance between own ship and point A is measured using the distance scale on the nautical chart, but this requires a great deal of effort and skill, and it is difficult to locate the distance on small ships, such as small coastal ships, because the space to spread out the nautical chart is narrow. There are drawbacks such as.

The present invention is designed so that the movable plate (2) is fitted into a linear ruler (4) as shown in the figure, the azimuth plate mounting shaft (3) is placed in the center, and the center of the azimuth plate is fitted onto the top of the axis so that the azimuth plate (1) can rotate. fix,
On the straight ruler (4), set the distance scale (5) of the nautical chart to be used, and on the other hand, set the Loran time difference scale (A) on the scale center line (6).
A stopper (b) and a hooking hole (c) are provided at one end of the ruler (4), and a true direction scale (8) is placed on the outer periphery of the direction plate (1).
) Magnetic direction scale (7) inside with scales 0 to 180, 90
The true azimuth scale and magnetic scale, which draw the azimuth line (9, 10) connecting ~270 degrees, are color-coded.

Since the configuration is as above, place the ruler (4) at point A from your own ship, move the direction line (9, 10) of the direction board (1) until it matches the nearby degree or longitude, and overlap it. The direction pointed by the ruler (4) is the direction, and it is a direction ruler that allows you to read the distance from the ruler (4).

[Brief explanation of drawings]

Fig. 1 is a plan view of the azimuth ruler of the present invention. Fig. 2 is a sectional view. (5)...
...Distance scale (6) ...Center line (7) ...Magnetic direction scale (8) ...True direction scale (9, 10) ...Direction line Patent applicant Masatoshi Yamamoto

Claims (1)

[Claims] A. An azimuth ruler in which the azimuth plate (1) can move parallel to the plane of the straight ruler (4) and rotate. B. A ruler with a distance scale (5) or a Loran time difference scale (a) on the straight ruler (4) side.