ARCH+: Zeitschrift für Architektur und Urbanismus: ARCH+ : Studienhefte für architekturbezogene Umweltforschung und -planung

Bibliografische Daten

Zeitschrift

Persistenter Identifier:: 1571051867188

Titel:: ARCH+: Zeitschrift für Architektur und Urbanismus

Erscheinungsort:: Aachen

Erscheinungsverlauf:: 1.1968-

Signatur:: Archiv IGMA; Universität Stuttgart, Institut für Grundlagen moderner Architektur und Entwerfen

Strukturtyp:: Zeitschrift

Sammlung:: Zeitschriften

Lizenz:: http://rightsstatements.org/vocab/InC/1.0/

Band

Persistenter Identifier:: 1571051867188_1969

Titel:: ARCH+ : Studienhefte für architekturbezogene Umweltforschung und -planung

Jahrgang/Band:: 1969, Jg. 2, H. 5-8

Erscheinungsjahr:: 1969

Sprache:: deutsch

Strukturtyp:: Band

Standort:: Universität Stuttgart, Institut für Grundlagen moderner Architektur und Entwerfen

Lizenz:: http://rightsstatements.org/vocab/InC/1.0/

Sammlung:: Zeitschriften

Ausgabe

Titel:: Heft 5: Planungstheorie

Strukturtyp:: Ausgabe

Artikel

Titel:: Entwicklung einer problemangemessenen Arbeitsmethode

Autor:: Stahl, Konrad

Strukturtyp:: Artikel

CR obo. } Chemical Notices from Foreign Sources. 108 —————————— ——— otis eam xplosion-point lies considerably higher than the point of ' Decomposition of Potassium Permanganate by ignition. } Dxygenated Water.—M. Berthelot.—These two com- The second seion of the work, at which we can but pounds, if brought in contact in a strongly acid liquid, ‘are glance briefly, treats of the pra&ical applications of explo- reciprocally decomposed, losing all their ative oxygen, sives, and the precautions necessary for their storage and ind being reduced to the state of protoxide. This change transport, including an abstra@ of the German laws regu. 8 due to the formation of an unstable compound, whose ating the carriage of dynamite, &c., by land or water. A spontaneous destruction explains the consecutive evolution summary of the whole art of blasting, and the arrangement of oxygen. This new colourless compound is stable at of mines and torpedoes, with the various forms given to —12%in the medium where it is produced, but is destroyed :hese destru@ive appliances, concludes a book which we >on assuming the ordinary temperature, The author re. should have been happy to notice at greater length did zards this compound as a hydrogen teroxide formed by space permit, ‘he oxidation of oxygenated water by potassic permangate. For manufa@urers of explosives, military and mining It is analogous to several peroxides and metallic acids, engineers, this treatise must prove of the highest value. and to hydrogen tersulphide. Nowhere else have we seen this important subject treated Electric Regulation of Time in Paris.—M. Tresca. with _such thoroughness and accuracy. The book i& _ The system employed is composed of a certain number plentifully illustrated, and is furnished with abundant of horar centres distributed over two telegraphic nets and bibliographical references. of the clocks of the city kept to the true time, so that the error can never exceed a minute. Analysis of the Luminous Phenomena Produced by Electric Discharges in Rarified Gases.—E. Fernet. —A large vertical tube, to each of the ends of which are soldered wires serving to pass the discharges of a Ruhm- korfi's coil, is placed in permanent connection with a Geissler pump. The tube is placed behind a screen in which is an upright slit. Opposite the slit is. fitted a re- volving mirror moved by a small turbine, and having its 1xis of rotation also vertical. The displacement of the mage seen in the mirror renders it possible to observe ‘he successive appearances offered by those points of the :ube left free by the slit. As soon as the rarefication is sufficient to permit the passage of the inverse induced :utrent, corresponding to the closing of the circuit, as well 1s of the dire@ induced current, corresponding to the sreaking of the circuit, two images are seen in the mirror. Three of the images thus obtained are figured. . Thermic Laws of Electric Sparks Produced by the Ordinary, Incomplete, and Partial Discharges of Condensers.—E. Villari.—The author proposes the fol- lowing laws :—(1.) When in a conduétive arc there are ‘ormed two sparks, one of which is against the discharger, she sum of the heats produced is constant.” (2.) The sum +f the lengths of the two sparks (one of which is against the discharger) is constant.” (3.) The total electric resist- ance which the two sparks encounter in the gases where they are formed is constant. (4.) The quantity of electri- city which constitutes the discharge of a condenser is constant whatever is the length of one of the sparks which are formed in the discharge itself. (5.) The total heat developed by the different sparks of the discharge of a condenser is inversely as its surface. Photography of the Solar Spe@trum.—E. Conche.— The proofs which the author presents to the Academy give the prolongation of the spectrum into the obscure symmetric region of the blue with reference to the extrame red. Density of Iodine at High Temperatures.—]. M. Crafts and F. Meier.—M. H. Sainte-Claire Deville has not only been the first to study the densities of bodies at very high temperatures, but he has been able to penetrate to the root of the question in his researches upon dissocia- ‘ion, and to reveal to us the causes of many anomalous densities. In the researches of MM. Deville and Troost -he deusity of iodine was determined as normal at 860° and 1040°% and serves as a point of comparison for the measurement of other densities. M.V. Meyer, on the contrary, finds the density of iodine anomalous after 590°. The want of agreement which seems to exist between these results has led us to take up the study of the subject, making use of a different process for the measurement of the temperatures, and a modified apparatus for the deter- minations of the density. M. Victor Meyer has been so obliging as to communicate some details on: his process n order to facilitate a comparison: The precise deter- ination of the temperature seemed to us of the greatest Comptes Rendus Hebdomadaires des Séances, Académie des Sciences. No. 12, March 22, 1880} Silver Teroxide.—M. Berthelot:—The author has re- zxamined the compound first obtained in 1804 by Ritter from the ele@rolysis of silver oxide. The substance is anstable, and in a short time the black brilliant metallic crystalline needles crumble to a black amorphous powder, with escape of oxygen. This change is accelerated by heat, and becomes explosive a little below 100° It is also decomposed by washing, the water gradually carrying off silver nitrate. The analysis of the recently-prepared com. pound shows the composition—4Ag0;,NOsAg, HO. The a regards it as the silver-salt of an argento-nitric acid.

Zugriffsbeschränkung

Nutzungslizenz

fullscreen: Chemical news and Journal of physical science (Volume 41, 1880 (January - June))

Zeitschrift

Band

Ausgabe

Artikel

Inhalt

Downloads

Ganzer Datensatz

Diese Seite

Bildfragment

Formate und Verlinkungen

Formate

Links

Zitieren

Ganzer Datensatz

Diese Seite

Zitierempfehlung