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Volume 10, Issue 1
Displaying 1-12 of 12 articles from this issue
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Yositada TAKENOUTI1941 Volume 10 Issue 1 Pages 1-6
Published: May 25, 1941
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSDownload PDF (297K) -
Hideaki YASUDA1941 Volume 10 Issue 1 Pages 7-10
Published: May 25, 1941
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSGreat differences are seen in the season, in which year rings or particularly dense or rare arrangement of circull appear on scales, otoliths and on vertebral bones of fishes. At rather wide variance from fish to fish are the effects of food supply or of temperature of medium upon the formation of dense circuli. These facts leads the author to doubt whether such environmental factors, as food and temperature, are really the factors affecting the arangement of circuli. To him, physiological factors such as growth or maturity seem to be more reasonable ones. In Table 1, are shown the varieties of arrangement of circuli formed in various months on the scales, otoliths or vertebral bones of several kinds of fishes, either young or adult, and the season of their sexual maturity are compared. Certain correspondence between the change in arrangement of circuli and the spawning season can be evidently observed.View full abstractDownload PDF (303K) -
Torazirô SAITÔ, Husao SIMIZU1941 Volume 10 Issue 1 Pages 11-13
Published: May 25, 1941
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSWith models, constructed according to TAUTI'S principles, the deformation Of SUGANO'S drag-net for fishing “Tara”, was studied, when the net was dragged with various speeds. Some improvements were made on the attachments to the net, in order to make the deformation least, even when the speed of drag was raised as high as 3 miles per hour.View full abstractDownload PDF (167K) -
Sigeo ÔTAKE1941 Volume 10 Issue 1 Pages 14-16
Published: May 25, 1941
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSMaximum moisture content W in sardine meal was observed when equilibrium was established in air at several temperatures from 0°C to 75°C, and at several humidity ranging from 10 to 100%. W is almost indifferent to temperature but varies with relative humidity r, according to an empirical equation: -
W=k(r/1-r)n, k and n being constauts, depending rather slightly on temperature. Before the equilibrium is reached, moisture content w increases with time t, so that in the equation W-w=We-k1t, k1 becomes constant, depending largely on temperature but not on humidity.View full abstractDownload PDF (182K) -
Tadasi ANDÔ, Sukenori UZAWA, Isao SIGETOMI1941 Volume 10 Issue 1 Pages 17-18
Published: May 25, 1941
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSPhysical properties, such as colour, specific gravity, viscosity and refractive index, as well as chemical properties, such as acid, saponification and iodine values, contents of unsaponified matter, and that of various fatty acids were determined with whale oils:-Blubber. head and bone oil of Physeter maerocephalus, blubber and tangue oil of Balaenoptera borealis, and blubber oil of Hyperaodon rostratum.View full abstractDownload PDF (130K) -
Tetunosuke YANAGAWA, Tositaka YOSIDA1941 Volume 10 Issue 1 Pages 19-22
Published: May 25, 1941
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSMany kinds of red-algae, which are raw-materials of agar-agar, were tested by a special jelly-strength test-methood.View full abstractDownload PDF (296K) -
Zirôzaemon SAITÔ1941 Volume 10 Issue 1 Pages 23-31
Published: May 25, 1941
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSThe rate of formation of hydrogen-swells of cold-reduced strip tinplate cans weer studied with packs of Japanese canned mandarin orange, having been compared with that of hot packrolled tinplate cans. After one year's storage at constant temperatnre of 37°C, the rate of hydrogen-swells in cold-reduced strip plate was 9 per cent, while that of hot-pack rolled plate (killed ingot) was as high as 69% (Fig. 2).
Both sample plates were analysed and examined metallographically, and hydrogen evolution value was also determined. After definite periods of storage, vacuum, pH, titration acidity and the amount of Sn and Fe in the content of sample cans were determined. The corrosion rates and corroding potentials of the steel bases of some of the cans, in citric acid and can syrup, were also determined. The results were investigated in relation to the rate of formation of hydrogen-swells.
It is shown that the high hydrogen evolution value and the low rate of hydrogen-swells formation of cold-reduced strip plate are due to the low metalloid content of strip steel and hence to the corrosion resistibility of the steel to the organic acid media.View full abstractDownload PDF (1293K) -
Ikio KANEKO1941 Volume 10 Issue 1 Pages 32-34
Published: May 25, 1941
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSBased on the inspection tables for 1939 salmon cans, frequency of appearances for each classes in “liquid”, “skin” and “top” was analysed statistically, with the result that these items have certain correlation with the total weight of the cans.View full abstractDownload PDF (193K) -
Zirô IKENAGA1941 Volume 10 Issue 1 Pages 35-37
Published: May 25, 1941
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSVertical displacement of the central point of end plate together with the volume change due to elastic deformation of the end plate of food cans was observed during repeated compression and evacuation inside of them. Both quantities vary in linear proportion to each other, with almost invariable proportional constants, though their relation to the interior pressure or vacuum is rather complicated, showing phenomena such as hysteresis and setting. The proportional constants mentioned above were calculated for 401 and 307 plates.View full abstractDownload PDF (164K) -
Hirotaka BAN, Yasuyuki KAZIWARA1941 Volume 10 Issue 1 Pages 38-42
Published: May 25, 1941
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSWith glass models, cooling of cans filled with water was studied, after the method previously adopted by TANI in the study of beating of them. Mode of circulation due to convection was visualized with aluminium powder suspended in water, which showed the existence of a thin swiftly descending layer against the lateral wall of the can. Temperatures, observed at several points in the region, where water is ascending very slowly, were plotted semilogarithmically against time, and the factor f. which represents the time required for the difference in temperature between the can and cooling medium to diminish to a tenth of the value, was examined. Approximate criteria on the relation between the factar f and the size of cans, i. e. height and radius, l and a, were derived for the cases, where the can was immersed in cooling media, where the lateral surface only was exposed to the media and where top end was cooled especially. The criteria, though simple in form, were proved satisfactory to explain the experimental results.View full abstractDownload PDF (276K) -
Toraitirô KINOSITA, Sangorô SIBUYA1941 Volume 10 Issue 1 Pages 43-46
Published: May 25, 1941
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSThe observations on the changes in numbers of larvae of Pecten and Gastropoda, appeared in the surface layer of Lake Saroma were made at intervals of 2 hours during 22-hours' period from 6.00 p. m., May 30th, 1940, to 4.00 p. m., next day, and showed that Gastropoda larvae abundantly appeared at flood-tide in the night, while the great number of Pecten larvae began to occur from the afternoon without relation to outer water inflowing.
Whether the changes were caused by the diurnal migrations of these organismus themselves or by the tidal ebb and flow, however, is not altogether certain, for these two factors were reduplicated in the observations. But the latter seems to be rather the more influential facter than the former. Further observations shall be continued on this point.View full abstractDownload PDF (918K) -
Hideo WADA1941 Volume 10 Issue 1 Pages 47-59
Published: May 25, 1941
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSExperiments were carried out in the neighbourhood of Huzan, Tyôsen, during a period spreading over 4 years, uiz., from 1934 to 1937 inclusive. Physiological as well as mechanical attachment incident to the germination was studied with special reference to exposure of the substrata to air. The shape of the newly germinated fronds was scrutinized in relation to the degree of salinity of the media. Experiments were also conducted on the germination of vegetative cells and thus the complete life-cycle of the alga in question is dwelled on in the text.View full abstractDownload PDF (4239K)
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