Friese antiker Bauwerke in Rom

Fiechter, Ernst Robert

Bibliografische Daten

Mappe

Persistenter Identifier:: 1680001495150

Titel:: Friese antiker Bauwerke in Rom

Künstler/Illustrator:: Fiechter, Ernst Robert

Erscheinungsjahr:: 1920-30er

Provenienz:: Nachlass Fiechter; Universität Stuttgart, Institut für Architekturgeschichte

Standort:: Universitätsbibliothek Stuttgart

Signatur:: 0016_01-22

Strukturtyp:: Mappe

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

Zeichnung

Titel:: Fries an den Caracalla-Thermen

Künstler/Illustrator:: Fiechter, Ernst Robert

Inhalt / Darstellungsart:: Detail Fries: Ansicht, Schnitt

Technik:: Tusche auf Karton

Erscheinungsort:: Rom

Erscheinungsjahr:: 1920-30er

Maße:: 62,5 x 45,3 cm

Funktion (Zeichnungstyp):: Bestandsaufnahme

Maßstab:: Metrisch 1:2, 1:5

Ort:: Rom; Italien

Standort:: Universitätsbibliothek Stuttgart

Signatur:: 0016_14

Bemerkung:: Erbauungszeit: 212-216 n. Ch.

Strukturtyp:: Zeichnung

8 Foreign Elements contained in Work Copper. {ness Maw, water which passes through is quite milky, but it gradually 1 precipitate gold by means of ferrous chloride. If tin is becomes clearer as the washing is continued. The washed not present, antimony and arsenic are better separated asbestos is then putin a beaker glass, and boiled for about according to Bunsen’s method, in the solution obtained by half an hour with strong hydrochloric acid (about 1 part brominised hydrochloric acid after removing the free bro- of fuming HCI to 4 parts of water). ’ mine with ammonia. In this case the weighed metallic The pulp, after this treatment, is poured over a perfo- sulphides must be tested for gold. rated platinum plate placed in a funnel,” and washed with 5. One litre of the liquid obtained in No. 1, correspond- distilled water until no acidity is shown by litmus-paper. ing to 50 grms. copper, is mixed with 4 drops of hydro- The pulp is then taken out of the funnel and strongly chloricacid. If a turbidity or a deposit of silver chloride is heated in a platinum dish. After letting it cool suffi formed, it is allowed to settle while hot, and a further drop ciently it may be placed in a wide-mouth bottle for future of hydrochloric acid is added, observing if all the silver is use. precipitated. If a turbidity is occasioned a few more drops of hydrochloric acid must be added, avoiding any appreciable excess. The silver chloride is most conveni- ently converted into metallic silver for weighing. The quantity found, if doubled and added to that obtained in No. 3, gives the percentage of silver. 6. The solution from No. 5 not rendered turbid by hy- drochloric acid, or filtered from a precipitate of silver chloride, is placed in a porcelain capsule, cautiously mixed with 85 grms. pure concentrated sulphuric acid, which has been previously diluted with water, evaporated till all nitric acid is expelled, mixed with water, heated till all the copper sulphate is dissolved, and the liquid then filtered into a 2-litre measuring-flask. The undissolved residue of ‘ead sulphate is washed, first with water containing sul. phuric acid, and then with alcohol, which is colleGted separately. It is then weighed, and tested for its purity by boiling it with a solution of ammonium acetate con- taining a little free ammonia. If an insoluble residue is left after repeated boiling it must be deducted from the lead sulphate and further examined. 7. The solution obtained in No. 6, separated from the lead sulphate by filtration, is made up to 2 litres, mixed, } litre of the solution is introduced into each of four ooiling-flasks, containing 1} litre, the contents of each are diluted with about } litre water, and to each is added 5o0c.c. hydrochloric acid of sp. gr. 1'12. They are heated to 707 and the copper is precipitated with sulphuretted hydrogen. The contents of the four flasks, when cold, are introduced into a tared 6-litre flask with a ground stopper: the boiling- Rasks are repeatedly rinsed out with sulphuretted hydrogen water, so that their entire contents are brought into the large flask. which after thorough mixing is weighed. If from the gross weight is deducted that of the empty flask and that of the copper sulphide (as calculated from the metallic copper), we obtain the weight of the solution in the flask. After the precipitate has settled, the super- natant liquid is drawn off as completely as possible : the ask with the precipitate and the remainder of the solu- tion is weighed, and the weight of the liquid drawn off is thus found. The latter is filtered, evaporated in a porce- lain capsule until the sulphuric acid is nearly all driven off; heated again with a little nitric acid, mixed with ammo- nia, filtered, the residue dissolved in hydrochloric acid, and again precipitated with ammonia. In the precipitate any iron present is determined preferably by precipitation with ammonium sulphide from the solution mixed with tartaric acid and ammonia, and converting the iron sul phide into iron oxide in the ordinary manner. From the fltrate, after addition of ammonium acetate and acidula- :ion with acetic acid, nickel, cobalt, and zinc are precipi- tated, if present, and separated and determined as usual. The quantities of iron, nickel, cobalt, and zinc present in the whole of the solution are then calculated. 8. To the precipitate, together with the residue of the solution left in the large flask, is added caustic soda-lye till the liquid has a strong alkaline rea®ion. A solution of sodium sulphide containing seme disulphide is then added in sufficient quantity, so that all antimony and arsenic sulphides may be dissolved, and the whole is gently heated for some time. It is then considerably diluted with water, mixed, weighed; the liquid is drawn off as far as possible, the flask with the rest of its contents is weighed, and the quantity of the liquid drawn off is thus ascer- tained. It is filtered, acidulated with hydrochloric acid.

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fullscreen: Chemical news and Journal of physical science (Volume 47, 1883 (January - June))

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