About the geology of tokyo, detail servey data have been published by the Rehabilitation Boarn of the time for over 20 years. The author also published a few reports on the same subject. It is by no means desirable to rewrite them. However, most of those data were lost on accouut of war or some other causes, and it may be necessary to reprint them. Since 1935, the author has been studying the nature of ground, underground water as well as the subsidence of the ground and has acoumulated some umpublished data. So, the preseat paper is presented in such meaning as stated before including those umpublisled data. Consequently, the paper is neither an elaborate report or a report of any new studies.

View full abstract

The electrical prospecting of the ground, especially the resistivity method, is very convenient and effective when applied for the problems of building foundation. In the present paper, the authors describe the principle of the resistivity method, the apparatus to be used, the method of analyzing the measured data and, furthermore, the actual prospecting examples carried out by this method.

View full abstract

This thesis is the one in which solution of statically indeterminate rigid frames are arranged to two methods-force mothod (kraftmethode) and deformation method (Deformationsmethod)-by way of linear transformation vector; in both mothods, with perfectly equal means, equations of elasticity is introduced mechanically. In Chapter I, linear transformation of vector, as the basie theory, is expounded; in Chepter II and III, solutions are vexplained definitely by each of deformation method and force method; and in Chapter IV solution of mixed method is proposed, in which force and defermation are mixed to unknown quantity.

View full abstract

In this paper (1) Various Tests for Crack Tendency of Arc welding Electrodes, (2) weldability Tests of Steel Plates, (3) Notch Sensitivity Tests of Steel plates and (4) Prevention of Cleavage Fracture in Welded Structures are discussed. Crack tendency of arc welding electrodes may be recognised as depending on two different characteristics, one of which is the volume change of weld metals from molten to solid states and another is the expansion of welded joints. The latter case is fairly analized by many researchers and me. Study on weldability of steel plates have been developed by German engineers. Special attention have been paid to some elements of composition of St. 52 and Chromium, Manganese and Silicium are responsible to hardnability of fusion zone. It must be mentioned, however, that limitation of these elements by specification is not good certification to prevent the cleavage fractures of Budersdorfer bridge. Notch sensitivity and transition temperature of steels rimmed or killed are thoroughly tested in the United States during and after the War. Author introduces these investigations from H. W. Pierce's papers reported on Jr. of the Japan welding Society. Finally author states that the continuity in designing of structures is the best method for prevention of these cracks.

View full abstract

[in Japanese]

View full abstract

Some special charts-Daylight Factor Diagrams-are constructed here by means of "Solid anlge projection" principles. These diagrams are used in practice to find brightness of any point on any surface by daylight openings, as in several examples.

View full abstract

It is obvious that ratio of road area in city area is, the larger, the better for traffic, but so much building area is scraped. Therefore, in this treatise I tried to count theoretically its necessary and least value for rush-hour traffic as the following: ρ=0.133+0.867ρ' here ρ……ratio of road area in city area ρ'……given by one of the following relations k……constant (=0.0004) δ……density of population As the result, it is efficacious when density of population in the city area is held in some limting value, by means of volume of building is restricted as the following relation: [numerical formula]heore α……ratio of flatten area of building in its site area α……living area for a man δ,ρ……already known.

View full abstract

This report is the result that we took the census of dwelling houses and living conditions about 3,278 houses in Yamano-Coal Mine. The result is following: 1) On the age structure of residents, the rate of the old is less than, and the child and the middle age is more than the average rate in the whole country. 2) The member of households of staffs is on the average 5.50 persons per family and that of coalminers is 4.73 persons per family. 3) The scale of dwelling of coal-miners that was built in Meiji is very smaller than that of staffs, but after-War the difference of both is little. 4) Average density of residence is 8.90 jo per person about staffs and 1.99 jo per person about coalminers. 5) As dwelling houses of coal-miners have few rooms, they sleep very densely in small rooms. 6) In small houses of coal-miners, the genkan (hall) and tokonoma of the greater part of these is used for other purposes. 7) The living condition of coal-miners is rural and that of staffs is urban.

View full abstract

This article is the outline of the Residential Works in Narimasu Area for Allied Personnel experimentally carried out from the administrative standpoint of construction progress. The works were partially given in charge to former Headquarters of Construction Works, Ministry of Transportation (present Headquarters of Construction Works (H.C.W.), Ministry of Construction) by Tokyo Metropolis so that former War Damage Rehabilitation Board (present Special Construction Bureau, Ministry of Construction; Special Procurement Board) can get reference materials for man-days and an estimated cost of the works in their future construction. The works were completed under direct management of H.C.W. with the partial exception of contract works which were carried out under guidance and control of H.C.W. The management of construction progress was principally carried out in following order: 1) To make charts, tables and graphs of the program of bringing in materials and offering labour services; 2) To Consider results of construction progress; 3) To check the lag of the works behind the schedule; 4) To plan to expedite the works under technical management. But because of post-war difficulties in securing labour services and materials, the construction was hardly expected to progress as previously arranged. For instance, we got a supply of planking when a supply of square timber was needed preferentially, and it resulted in waste of labour. Furthermore we sometimes recieved orders of G.H.Q. to hold up the works in order to re-inspect them in executive and technical aspects. These and many other factors hampered the execution of the original scheme. But we did our best to secure the most ideal management of the works as possible. We report the exact analytical research for labour services of the works, hoping this article may serve you as any reference data.

View full abstract

Prior to the 14th Century, there were but 3 local cities of political importance, Dazaifu, Hiraizumi and Kamakura, in our country. In the end of Ashikaga Era, along with the increase of population and circulation of currecy, the commercial and industrial activities were stimulated, and the metropolitan civilization crept into the local life and the air of local city foundation is gradually fermented. The more direct motive was the change of the technigue of fortification of local land lords. The present paper deals with the foundation of local cities from historical point of view, condenced from the Doctor thesis prepared by the author.

View full abstract

In order to get the complete form of the architecture, we must make plan, search and convey materials and construct. Therefore, to understand the historical Japanese architecture under the background of culture, it is necessary too to know its indusrial process. The meaning of the history of technology is in this point. So, we are to research the place of getting materials, both timber and stone, and conveying route of these. A part of these were researched already by many scholors. But these are not yet completely done. Specially my treatise already issued is uncompleted and contains some mistake. So, supplying these, adding our new opinion, I made up my mind to write this new treatise.

View full abstract

Lecture-Hall (Kodo) of Toshodaiji Temple, it is said, which had been the assembly hall (Choshudo) of the Heijo Palace, was granted to this temple through the Imperial decree. This hall, however, do not preserve its original appearance in view of its style, namely it was rebuilt as a Buddhist temple. Besides this, it had many changes in style through the repairings in 1275, in the Empo era(1673-1680) in 1905 and so forth. Although the hall, in this way, has almost lost its original form in the course of times, yet it is a rare surviving palace building, which models, on the whole, after the style of the Nara period In this study, I tried to examine almost all members of this building, and classified them according to their shape, traces of repairings and degree of weathering etc. to 5 kinds, mamely, to original ones, (Palace building) secondary ones, (first rebuilt lecture hall) ones which were supplied in 1275, 1673-1680 and 1905. If we had chance of dismenberment such as for the purpose of repairing, we could have realized this object more completely. But now, as we could only see the exposed surface of any menbers, I could not be through-going. But, I came to this conclusion. The original shape of the assembly hall had Kirizuma (gable) style, bracket beneath the eaves was the simplest, Daito Hijiki, (Girder is supported by one arm and one capital on the column) no ceilings just like Dempodo, Horyuji. (Nara period) However I could not say where doors and walls were placed and how the floor was paved. Besides, I have a doubt whether front eaves (Dobisashi) was originally attached or it was only attached in later time. (It was withdrawn in the Empo era, and we could only see the traces on the surface of columns etc.)

View full abstract