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In Triangulation the quadrilateral triangulation net is well utilized for the base net triangulation net requiring accuracy. The accuracy o adjusting method should be pursued so as to be in accord with the object of quadrilateral triangulation net requiring high accuracy. Therefore I compared the peculiarity and result of rigorous method which is not practically used with those of three approximate methods which are now practically used, and by contriving the convenient method and simple formula. I suggested the convenient gists in the use of rigorours method
The geodetic carvature radius used in the geodetic survey is different in length according to the latitude and the direction. A considerable amount of time and efforts are necessary in calculating the carvature radius corresponding to a certain direction in a given latitude and the point. In this study I expressed with a take by calculating the various carvature radius according to each seperating so as be convenient in practical use in our country. By solving the example questions, I examined, comparing the usage, the accuracy and the characteristic according to each carvature radius.
The entreaied air in the concrete by the cement mixture makes a considerable contribution to the making of a good concrede improving the various qualities of air entrained concrete. Considering the fact that the entrained air suffers a loss owing to the various causes, the entrained air has various kinds of elements which incur losses on the special qualities of air entrained concrete. As a result of the investigation and anlaysis on this problem, in this paper author suggested the choice of materials,the quaritity of materials and the matters that demand special attention in the methods of treatment etc..
In surveying we usually measure th azimuth of the course by the declinometer, which method is widely used in the surveying. Owing mainly to the effect of the magnetic declination and the local attraction, however, the azimuth surveying by the declinometer of the transit can't assure us of its accuracy. When we find the above method unsatistactory, we must get it another way; by the triangulation table of the geography. But either of them gives us complicated calculation as well as much field work. We, therefore, observe the surveying method as follows; by the refraction and the parallax, field work and the measurement of the due north and the latitude through the astronomical observation.
The earth is a revolving elliptic heavenly body, so when deciding its size we use the average value of long radius and short radius; but, in fact, according to the latitude the difference of the centre of curvature becomes very remarkable. In this paper the auther calculated the value of the centre of curvature of the earth and then tried to compare its value with that of the earth radius which is being used in our country. Besides, by replacementing the value of right angle, the author tried to calculate the error of curvatmre, the error of refraction and the error due to both curvature and refraction.