Architektonische Details aus dem Dom in Florenz

Linck (?), Wilhelm

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Persistenter Identifier:: 1496389432420

Titel:: Architektonische Details aus dem Dom in Florenz

Künstler/Illustrator:: Linck (?), Wilhelm

Inventarnummer:: Linc0195

Besitzende Institution:: Universitätsbibliothek Stuttgart

Standort:: Universitätsbibliothek Stuttgart

Lizenz:: https://creativecommons.org/publicdomain/mark/1.0/deed.de

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Titel:: Pfeiler aus dem Dom von Florenz

Künstler/Illustrator:: Linck (?), Wilhelm

Inhalt / Darstellungsart:: Ansicht und Schnitt

Technik:: Bleistift auf Papier, z. T. rosa laviert

Erscheinungsort:: Florenz

Erscheinungsjahr:: Mitte 19. Jahrhundert

Maße:: 15,2 x 21,2 cm

Funktion (Zeichnungstyp):: Reiseskizze

Besitzende Institution:: Universitätsbibliothek Stuttgart

Ort:: Florenz

Standort:: Universitätsbibliothek Stuttgart

Signatur:: Linc0195b

Strukturtyp:: Zeichnung

6 I ree en Ihe elaterin cakes together, dissolves slowly, and imparts a yellow colour to the acid. If the carbolic is now added the reaction is obtained very imperfe@ly. The reagents should therefore be added in the order stated above. The test can be applied dire& to some samples of the elaterium of commerce (dried sediment of the juice) if they are reduced to fine powder. Other samples may require the powder to be agitated with chloroform and the solution filtered. A few drops of the filtrate evaporated to dryness by blowing on the surlace will afford a residue for testing. Falmouth, Jamaica, December 6, 1877, Action of Sulphuric Acid on Copper. {a Nuns, gaseous mixtures. A fish-tail burner was used throughout the experiments. In reply to the CuarrmaN, Dr. FRANKLAND stated that this increase in the illuminating power of benzol when mixed with marsh gas was not opposed to his former statement, that marsh gas did not contribute materially to the illuminating power of coal gas, because in coal gas she principal hydrocarbons were ethylene and members of that series, which would not raise the temperature to any considerable extent when burnt with matsh gas as com. pared with the effe® produced by benzol vapour and marsh gas. After the thanks of the Society had been given to the awthors, Dr. GILBERT, Vice-President, took the Chair. The next paper was read by Mr. PERKIN, “On the Action of Reducing Agents on Potassium Permanganate,” by F. Jones. Hydrogen in neutral solutions decomposes permanganate according to the following equation: 2KMnO, 48H = Mn,0;+2KHO+3H,0 ; the readion is 1astened by raising the temperature. In solutions ‘endered acid by sulphuric acid hydrogen produces a similar decomposition. In alkaline solutions a similar action takes place, but much more slowly, 2 manganate beingfirstformed. Ammonia produces the decomposition— 3KMnO,+8NH;==4Mn,03+KNO3;+KNO,+6KHO+gH,0 +6N Phosphine when passed through a series of flasks containing solution of potassium permanganate forms ses. Juioxide of manganese, phosphorovs and phosphoric acids, 6KMnO + 4PHz==3Mn;03+ 2K, HPO; +2KH,PO;+3H,0 and 2KMnO, + PHy=Mn,03+K,HPO,+H,0. ~ Arsine asroduces a similar rea&tion,— * 2KMnO4+4-AsH3=Mn,03+ K,HAsO,+H,0. The reaction with stibine is— 2KMnO,+ SbHj =Mn,0;+ K,HSbO, + H,0. The first ation of oxalic acid on potassium permanganate results in the formation of manganese and potassium oxalates, water, and carbonic acid. A further addition of permanganate precipitates manganese sesquioxide, carbonic acid and oxygen being evolved, and potassium carbonate formed. In the presence of sulphuric acid oxygen is given off. Oxygen is also evolved with carbonic acid, when sulphuric acid acts on manganese dioxide in presence of an oxalate. When strong solutions of permanganate and manganese chloride are mixed, sesjuioxide of manganese separates out, whilst bubbles, consisting of chlorine and oxygen are evolved. By mixing dilute solutions oxygen, but no chlorine, is evolved, Solutions of ferrous and manganese sulphates similarly evolve oxygen when mixed with solutions of potassium permanganate, Mr. HowArD remarked that in the Exhibition at Paris, 1867, a compound was exhibited which was said to be permanganate of ammonium ; itexploded eventually with some violence, It was curious that such a compound could have been formed and sent to the exhibition when, according to the rca@ion in the above paper, ammonia decomposes permanganate soon after the substances are mixed. The next paper was read by Mr. SPENCER PickeRING, “ On the Action of Sulphuric Acid on Copper.” According to the author there are only two primary rea&ions., The first is represented by the equation— Cu+2H,S0,=CuS0,+50,-+2H,0, the second, 5Cu+4H,S0,=Cu,S +3CuS0,+4H,0. Other products which may be formed are due to the subsequent decomposition of the sub-sulphide by sulphuric acid. Pure ele@rotype-foil, 0'15 m.m. thick, was used, 0'3 grm. being a&ed on by 16-3 c.c. strong sulphuric acid (sp. gr. 1843) for thirty minutes. The acion commences at 19° rapidly increasing as the temperature rises. But ittle gas is evolved until 130° is reached. No gas, such PROCEEDINGS OF SOCIETIES. CHEMICAL SOCIETY. Thursday, Fanuary 17, 1878. Professor OpLING, Vice-President, in the Chair. AFTER the confirmation of the minutes of the previous meeting, the reading of presents to the Library, &c., the following certificates were read for the first time :(—W. Hudson, G. S. Johnson, T. Lichtenstein, W. B. Lowe, and L. T. Wright, . The CHAIRMAN then announced that a ballot for the election of Fellows would take place at the next meeting of the Society (Feb. 7). ! The first paper was entitled “On the Luminosity of Benzol when Burnt with Non-luminous Combustible Gases,” by E. FRANKLAND and L. T. THORNE. It was pointed out by Dr. Frankland in 1852 (Memoirs Manchester Lit. and Phil. Soc., 2nd Series, X., 71) that hydrogen, carbonic oxide, and marsh gas practically contribute nothing to the luminosity of coal gas, and that the only constituents of value were benzol, ethylene, propylene, butylene, and acetylene. The authors have endeavoured to determine the luminosity of benzol individually, and propose in future papers to make similar experiments on the other illuminating constituents of coal gas. Many attempts were made to burn benzol with a smokeless flame, and several lamps were constructed by Mr. Silber, but all the experiments yielded unsatisfactory results, and the authors had to limit their experiments to the determination of the luminosity of benzol vapour after dilution with hydrogen, carbonic oxide, and marsh gas. These three gases were severally prepared in the usual way. and were passed through a brass cylinder, 64 inches long, 3 inches internal diameter, packed with Sponge saturated with pure benzol, the whole being kept at a constant temperature by immersion in water. The quantity of benzol in the gas was determined by absorption with sulphuric acid. The authors obtained the following numbers :— t cub. foot of benzol vapour burnt with hydrogen gave for one hour the light of .. 6971 candles. Ditto with carbonic oxide .. .. .. «73738, Ditto with marsh gas (1st series) .. .. 92°45 Ditto with marsh gas (2nd series) .. .. 03'04 at the standard temperature and pressure. Hence, 1 Ib, avoirdupois of benzol gives, when burnt with hydrogen, the light yielded by 5793 lbs. of spermaceti; with car. bonic oxide, 6'100; with marsh gas (1st series), 7682 ; with marsh gas (2nd series), 7°803 ; or, in other words, a given weight of benzol produces 53 per cent more light when it is diluted with carbonic oxide, and between 32'6 and 34°7 per cent more light when diluted with marsh gas than when diffused in hydrogen. The authors point out that this difference is probably due at all events in part to the different pyrometric thermal effets of the

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Objekt : Chemical news and Journal of physical science (Volume 37, 1878 (January - June))

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