Tidal calculation ruler

Abstract

The invention discloses a tide calculating ruler which comprises a main ruler plate, sliding arms are arranged at the two ends of the back face of the main ruler plate, and auxiliary rolling shafts are arranged at the two sides of the back face of the main ruler plate; the two ends of the auxiliary rolling shaft are sleeved with tooth-shaped reticle shafts, and the tooth-shaped reticle shafts are rotationally connected with the sliding arms; a transmission mechanism connected with the sliding arm is arranged in the middle of the side surface of the main ruler plate; a tide time auxiliary ruler and a tide height auxiliary ruler are included; one of the tide time auxiliary ruler and the tide height auxiliary ruler is arranged on the tooth-shaped reticle shaft at one end of the auxiliary rolling shaft in a sleeving mode, and the other one is arranged on the tooth-shaped reticle shaft at the other end of the auxiliary rolling shaft in a sleeving mode; and the front surface of the main ruler plate is provided with a tide height and tide time comparison division, one end of the main ruler plate is provided with a tide time difference ruler, and the other end is provided with a tide height difference ruler. According to the invention, through ingenious structural combination of the soft steel auxiliary ruler and the tooth-shaped dividing shaft, the measurement and calculation accuracy of the instrument is ensured, and from a practical perspective, the problem in conveniently and quickly calculating tide time and tide is solved.

Description

technical field [0001] The invention relates to a tidal slide rule, which belongs to the technical field of navigation. Background technique [0002] Provides isosceles ladder diagram cards for calculating tidal height at any tidal hour and high tide at any tidal hour in nautical science. Since the tidal fluctuation is similar to a cosine curve, according to the calculation formula of arbitrary tidal time and tidal height, a paper-based isosceles trapezoidal chart is drawn. [0003] The existing isosceles ladder diagram card has the following disadvantages: 1. The main map, tide hour ruler and tide height ruler of the ladder diagram card are paper cards and paper strips, which are easy to be damaged and lost; 2. The existing ladder diagram card The intervals between the scale divisions of the tidal time difference scale and the tidal height difference scale are large, and the calculation accuracy is not high; 3. The main map, the tide time scale and the tide height scale ar...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of tidal slide ruler, to solve the problem that the tide hour ruler and the tide height ruler in the prior art are independent, when the tide hour ruler and the tide height ruler are translated to the corresponding scale divisions on the hypotenuse of the isosceles ladder diagram It is difficult to align the defects of the tick marks when

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