The Journal of the College of Science, Imperial University of Tokyo, Japan = Tokyo Teikoku Daigaku kiyo. Rika

:c-pm ^^ ^a-:/ f^'ji'xi~.f] : (1t^ ft??Ä ^^ m, ^t mr^ m » f3 3ê Jtft THE JOURNAL OF THE COLLEGE OF SCIENCE IMPERIAL UNIVERSITY OF TOKYO. Vol. XLI. PUBLISHED BY THE UNIVEESITY. TOKYO. JAPAN. 1917—1921. TAISHO 6-10.Committee,Publishing Director of the CollegeProf. Bigakuhakushi, (exS. Goto, officio). Prof. I. Ijima, Ph. D., Bigakuhakushi. Prof. F. Ömori, Bigakuhakushi. Prof. S. Watasé, Ph. D., Bigakuhakushi.— — — CONTENTS. :and Tukamoto1. T. Terada, M. ]\iuti J. On diural variation ofArt. Publ. November 20th, 1917.barometric pressure. :Y. Shibata and T. Muraki Mesotomisation of diammine-Art. 2. complex and determination of the configura-dinitro-oxalo-cobalt diammine-tetranitro-cobalt complex.tions ofthis complex and of November 30th, 1917.Publ. : on the distrib ition of theArt. 3. K. Hirayama —Researches mean WifJi 1 plate. Publ. March 30th,motions of the asteroids. 1918. :4. M. Kuntieda —Asymptotic formulae for oscillating Dirichlet'sArt. Publ. April 30th, 1919.coefificients of power series.integrals and :Ishimoto and M. Imamura —On the effectT. Terada, M. ofArt. 5. Publ. June 13th,topography on the precipitation in Japan. 1919. :Y. Shibata Recherches sur les spectres d'absorption desArt. 6. III. Spectres desammine-complexes métalliques. chrome et de cuivre. Avec 18sels complexes de nickel, de Publ. March 20th, 1920.figures. :7. Yamada Magnetic separations of the lines of iron, nickelArt. K. — Publ. Februarydifferent fields. With 20 plates.and zinc in 28th, 1921. of iron lines in different8. Y. Takahashi :--Magnetic separationsArt. Publ. February 28tb, 1921.fields. With l3 plates. T. des relativ Abel'schen Zahl-Art. 9. Takagi :—Ueber eine Theorie 3 1st, 1920.körpers. Publ. July : configuration of theK. Matsuno —On the stereochemicalArt. 10. salts. Publ.and diammine cobalt complexaquotriammine March 31st, 1921. : sulphide sol byArt. 11. K. Matsuno —The coagulation of arsenious 1921.cobaltic complexes. Publ. March 31st, BY THE TOKYO PRIN 1 ING CO., LTD.PRINTED ~x^-^'^JOUllNAL OF THE COLLEGE OF SClENeF, TuKYO IMPERIAL UNIVERSITY. VOL. XLT., ART. 1. Diurnal Variation of Barometric Pressure.On II. from the Geophysical Seminary(Contribution in the Physical Institute, Co!lege of Science}. By Torahiko TeRADA, Eg ikiihakusJii, KlUTl, , JyunMasazô TUKAMOTO, Eigakmh f, Eigakushi. 1. While the amplitudes and phases of the semidiurnal wave of barometric pressure show a very regular distribution over the the earth, the diurnal component dependentire surface of those of remarkably on secondary local conditions, as was fully illustrated by the classical investigations of A. Angot'^ and J. Hann.^^ According to the recent aerological investigations/^ the diurnal daily of temperature is conspicuouscomponent of the variation in the lowest kilometer of the atmosphere, and it seemschiefly quite natural that the corresponding diurnal component of the of the nature ofbarometric pressure is influenced by the variety earth's surface within comparatively narrow extent.the underlying moment the picture of the isobaric surface at aboutImagine for a etc.,over land with irregular patches of water, desert2 km, a up by the solar radia-while the earth's surface is rapidly heated surface will be scattered over with numeroustion. The isobaric theaccording to the nature of the substratum, andhills and dales, subsist withoutresulting horizontal gradient of pressure cannot the heatingthe flow of air tending to annul the gradient. When Angot, Annales du Bureau Central Météorologique de France, 1887.1.) A. 49-121.uiath.-naturwis?. Kl., 55,J. Hann, Denkschriften d. kais. Akad. d. Wiss., pp.2.) bei Lindenberg,Eeger, Arbeiten d. kon. preuss. aeronautischen Observatoriums 8, p.3.) 229.Art. l.-T. Terîlda:2 rapid, the state can be maintained, since the flow isis sufficiently partly hindered by the friction of the underlying layer and also the influence the Coriolis's force. The irregularity of smalldeviating of due to the influence of the immediate neighbourhood will bescale down as we proceed higher and higher, andgradually smoothed of the remoter substratum will gradually come intothe influence play. The above idea is not at all essentially new, being entertained among others.'^ Itby the authorities such as Hann and Angot otherwise impossible to account -for the irregularseems indeed nature of the geographical distribution of the diurnal components as actually observed. As far as we are aware, there were however these effects ofas yet no serious attempt made to consider local more and to deduce anything in way ofconditions a little closely some rules or laws from among the apparently intractablefinding of materials. The present communication is the results ofchaos some trials dared in tliis direction. Though far from laying an^^ of norserious claim on the rigorousness the method employed, on exhaustiveness of the materials utilized, the essential featuresthe some of the results given below may be of some interests forof meteorologists. 2. The beginning of the present investigation dates back to ofseveral years ago when the attention the one of the author was simple chart by Buchan'\drawn })y the constructed showing roughly the geographical distribution of the daily amplitude of barometric pressure over the world. The dependency of the ampli- tude on the distriljution of and water was so conspicuous thatland it seemed quite feasible to infer some quantitative relation between the amplitude and the proportion of land and water over a certain definite area. To carry out the comparison, the following procedure was taken. The amplitudes variation at differentof the pressure 20° 40°points on the circles of latitude and respective!}' were estimated from the chart by interpolation and plotted in a diagram 1.) e. (/. Bürnstoin, Wiener Borichto, 2a, 721 Met. Z.S., 837.113, 1904, p. ; 7, p. Buchan,2.) Challen>fer Report, Phys. and Clieui. 2, Report on Atmospheric Circulation, p. 21, Fii,'. 2.