ISSN:0003-813X    

DOI:10.1111/j.1475-4754.1975.tb00128.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

ABSTRACTSBrass alloys from Ife are compared with a selection of brasses from Benin. Four sources of mixed zinc and lead ore were used in Ife. In Benin lead and copper from different sources were added to these four alloys, which may represent the melting down of older castings. Comparisons are made with analyses from Europe and other parts of Africa.

ISSN:0003-813X    

DOI:10.1111/j.1475-4754.1975.tb00129.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

ABSTRACTSA study of the impurity distributions in copper obtained from various ores shows no significant correlations between the impurity distributions. A test of 390 samples of copper obtained from various ores shows that more than 75% of copper samples can be correctly identified as coming from either simple copper metal ores, oxidized ores or more complex reduced ores thereby yielding information on the metallurgical capabilities of the society smelting the ores.

ISSN:0003-813X    

DOI:10.1111/j.1475-4754.1975.tb00130.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

ABSTRACTSThe paper presents the results of a feasibility study of the application of X‐ray fluorescence analysis to nondestructive analysis of coins. Radioisotope sources55Fe,241Am,109Cd and238Pu were used for excitation and a Si/Li detector with a multichannel analyser for the measurement of characteristic X‐ray lines. Silver and copper in Polish renaissance coins have been analysed. Analysis using Ag K and Ag L lines allows one to distinguish between blanched and unblanched coins. The accuracy of the silver determination using Ag K X‐rays is claimed to be ± 0.5% Ag for homogenous coins and ± 1.0% Ag for blanched but well‐preserved uncorro

ISSN:0003-813X    

DOI:10.1111/j.1475-4754.1975.tb00131.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

ABSTRACTSResults of analysis, mainly by X‐ray fluorescence, are presented for a representative selection of enamelled brooches. The enamel composition is quite distinct, and shows considerable technical sophistication on the part of the manufacturers. The production of different colours and of opacity in the enamel is related to the chemical composition, and analyses of the metal substrate suggest that the alloy was carefully chosen. The implications of this investigation for the study of Roman enamelwork in general are discusse

ISSN:0003-813X    

DOI:10.1111/j.1475-4754.1975.tb00132.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

ABSTRACTSThe composition diagrams of the La Graufesenque, Banassac and Montans Terra Sigillata are given as well as a calculation method to improve the separation between the workshops with compositions which are very similar. This method can then be generalized.

ISSN:0003-813X    

DOI:10.1111/j.1475-4754.1975.tb00133.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

ABSTRACTSMinor and trace elements (K, Sr, Ba, Al, Fe, Mn, Si, Ti) have been measured in marbles from classical mediterranean quarries (Afyon, Denizli, Aphrodisias, Ephesus, Marmara and Carrara). A distinctive characterization of the classical marble sources by means of such chemical parameters seems very difficult, although some distinctions can be attempted between a few different areas and zones, within an area.

ISSN:0003-813X    

DOI:10.1111/j.1475-4754.1975.tb00134.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

ABSTRACTS13C/12C and18O/16O ratios have been measured for 42 marbles from the main quarry localities of archaeological interest of Western Anatolia (Marmara, Ephesos, Aphrodisias, Denizli and Afyon) in order to test the possibility of isotopically characterizing ancient marbles from this region. The various groups of samples are not clearly distinguishable on a δ13C‐δ18O diagram. However, if only white or slightly coloured samples are considered, the isotopic method appears to be much more select

ISSN:0003-813X    

DOI:10.1111/j.1475-4754.1975.tb00135.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

ABSTRACTSIn order to ascertain whether the technology of Etruscan bucchero was similar everywhere or showed local variation, a comparative study was carried out on 23 samples of bucchero from different sites. The use of carbon dust as a black pigment in this type of pottery was confirmed in all samples, while the hypothesis of the addition of MnO2as a colouring was disproved. Further information on the nature of the basic constituents of Etruscan bucchero was also provided.

ISSN:0003-813X    

DOI:10.1111/j.1475-4754.1975.tb00136.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

ABSTRACTSIt is shown, from comparisons with the optical absorption of minerals, that the black and grey colours of pottery can arise from Fe2+Fe3+and Fe2+Ti4+charge‐transfer (or electron‐hopping) processes, the cations being located at the centres of adjacent edge‐sharing octa

ISSN:0003-813X    

DOI:10.1111/j.1475-4754.1975.tb00137.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY