Showing papers on "Bronze published in 1979"

The bronze bowls from Ban Don Ta Phet, Thailand: An enigma of prehistoric metallurgy

Abstract: Remains of 3rd-2nd century B.C. Iron Age bronze bowls from Ban Don Ta Phet, Thailand, are examined. Metallographic analysis indicates a manufacturing technique involving casting mechanical hot-working, heat treatment and quenching, followed by polishing on a wheel or lathe. X-ray fluorescence found a very high tin bronze (23%). Comparison to bowls from other comparable sites are made. -- AATA

Coating of plant seeds

Abstract: A binder solution for applying plant protectants and similar agents to seeds includes a metal pigment such as copper, aluminium or bronze. Presence of the pigment produces a particularly smooth-surfaced coating providing improved abrasion resistance and flow properties.

Las primeras fases del poblado de Los Saladares (Orihuela, Alicante). Una contribución al estudio del Bronce Final en la Península Ibérica (Estudio crítico 1)

Abstract: Stratigraphie horizontale et verticale dans le secteur VIII. Niveaux et constructions, interpretation des differentes phases du secteur VIII. Inventaire ceramique| paralleles. La place de L. S. dans les sites de l'âge du Bronze| problematique regionale du Bronze final de L. S.| la place du Bronze final de L. S. dans la protohistoire de la Peninsule et de la Mediterranee. Chronologie relative du Bronze tardif et final de la basse vallee du Segura.

Fuel cell oxygen electrode

Abstract: An oxygen electrode for a fuel cell utilizing an acid electrolyte has a substrate of an alkali metal tungsten bronze of the formula: Ax WO3 where A is an alkali metal and x is at least 0.2, which is covered with a thin layer of platinum tungsten bronze of the formula: Pty WO3 where y is at least 0.8.

Formation, structure, and topotactic exchange reactions of the layered hydrogen bronze HxV3O8

Abstract: On reaction of the non-stoicheiometric vanadium bronze Li1+xV3O8 with aqueous acids a novel type of layered hydrogen bronze H1+xV3O8·nH2O (1; monoclinic lattice parameters: a= 10·27 b= 3·61, c= 12·42 A, β= 112·5°), which exhibits Bronsted acid and polyelectrolyte character, is obtained in a topotactic process; reaction of (1) with organic Lewis bases L results in the formation of a new class of layered intercalation complexes LnH1+xV3O8.

Evidence of Social Stratification in Bronze Age Denmark

Abstract: The Late Bronze Age hoards (12th–6th centuries B.C.) from Denmark are examined as evidence of the existence of social ranking in that prehistoric society. The hoards contain bronze weapons and ornaments which seem to function as sumptuary goods and appear to be ranked according to regular rules. The hoards also represent economic wealth and include objects of ritual importance. This intersection, in single finds, of material reflections of the political, religious, and economic systems in the society, along with the inferred existence of social ranking, suggests the presence of a prehistoric chiefdom in Denmark in the Late Bronze Age.

Nigerian Bronze Bells

Abstract: Les differents types de cloches de bronze du Sud du Nigeria (Benin et communautes Yoruba). Leurs methodes de fabrication.

Reaction treatment, critical current, transition temperature and bend properties of a niobium-bronze process multifilamentary superconductor

Abstract: Critical current, T c , and bend properties were measured on samples of a 0.010" (.025 cm) diameter bronze and niobium multifilament conductor which were reacted at 650-800°C. The conductor consisted of 4453 niobium filaments in a 13 wt% bronze matrix. The critical currents exhibit a peak as a function of reaction time at each temperature. The highest I c of 98 amperes, corresponding to an overall current density of 1.8×105Amp/cm2at 7 T and 4.2 K was achieved for a reaction at 650C for 7000 minutes. Inductive T c measurements and critical current as a function of bend diameter are reported.

The Wear of Aluminum-Bronze on Steel in the Presence of Aviation Fuel

Abstract: A study has been made of the action of a commercially available corrosion inhibitor added to hydrofined aviation fuels in reducing the wear of aluminum bronze sliding on KE180, 13 percent chromium steel. From measurements of friction and wear and an extensive examination of surfaces using Auger electron spectroscopy, a surface model has been proposed which elucidates the mechanism of wear protection. Presented as an American Society of Lubrication Engineers paper at the ASLE/ASME Lubrication Conference in Kansas City, Missouri, October 3–5, 1977

The use of a stabilizing wax to protect brass and bronze artifacts

Abstract: A stabilizing wax formulation is proposed as an alternative to lacquers for protecting copper, brass, and bronze against atmospheric corrosion and tarnishing. This special wax is based on Renaissance microcrystalline wax and benzotriazole. The photo-oxidation of Incralac lacquer as it relates to its removability was also determined.

Cylinder drum for axial piston machine - has steel or aluminium cylinders with antifriction internal bronze layer

Abstract: The cylinder drum for an axial piston machine sleeve is coated with low friction material to provide high thermal stability above 250 deg.C. The sleeve (6) is made of steel and the thin antifriction layer of bronze. The low friction coating thickness is 1.5% of the bore dia. The cylinder drum (1) can also be made of pref. aluminium alloy for reducing weight.

Brass alloy with superior oxidation resistance at high temperature

Abstract: PURPOSE: To obtain a brass alloy for a heat resistant member with improved oxidation resistance at high temp. by specifying the Al and Fe contents of a brass alloy composition and adding a small amount of Ni and Si. CONSTITUTION: This brass alloy consists of, by wt., 55W70% Cu, 1.0W5.0% Al, 0.1W3.0% Ni, 0.1W2.0% Fe, 0.5W1.5% Si and the balance Zn. By this composition this alloy is provided with enhanced oxidation resistance at high temp. in comparison with an ordinary bronze material, and the oxidation resistance is about equal to that of aluminum bronze. This alloy is more inexpensive than aluminum bronze, is heated at a lower temp., and has superior forgeability, so it is used as a material for a heat resistant member, etc. COPYRIGHT: (C)1981,JPO&Japio

Conservation of a monumental outdoor bronze sculpture: theodore roosevelt by paul manship

Abstract: The paper describes a conservation program for a 15-year old monumental bronze sculpture whose state of preservation was satisfactory, but whose visual appearance was poor. A thick coat of pigmented wax was removed with solvent. Graffiti were patinated. The metal was protected from corrosion by the application of benzotriazole and two coats of wax. Examination after one year showed that the bronze was stable; the statue was rewaxed.

Mechanical properties of Cu-Al-Fe alloys

Abstract: The strength and ductile characteristics of Cu-Al-Fe alloys with 8–14% Al and 13–40% Fe are superior to those of bronze BrAZh9-4 The properties of these alloys can be varied within wide limits by means of heat treatment

A Newly Found Inscription on a Pair of Silver Bracelets from Castlethorpe, Buckinghamshire

Abstract: In about 1827 a small hoard of coins and jewellery was found whilst ploughing at Castle-thorpe, Buckinghamshire. The hoard consisted of a pair of silver bracelets, a silver ring with a cornelian intaglio showing Bonus Eventus, and silver and bronze coins, the latest of which belonged to the reigns of Antoninus Pius (138–161) and Verus (161–169). The hoard had been contained in a ‘small black urn’ which was not recovered at the time. During a recent detailed study of the jewellery, which is now in the British Museum, it was observed that the bracelets were inscribed.

A Seventh-Century Bronze Metalworker’s Die from Rochester, Kent

Abstract: The town of Rochester in Kent originated as a Romano-British settlement at the eastern end of the long bridge which carried the Roman Watling Street over the River Medway and its marshes. In the third century it was walled. The Romano-British name for it was Durobrivae, the 'stronghold at the bridge', but by the end of the seventh century, if not much earlier, the Anglo-Saxon settlers of Kent had corrupted the name to Hrofesceaster, whence Rochester today. It is clear from the archaeological evidence that the Medway formed the western frontier of the Anglo-Saxon kingdom of Kent, the. people living in the western part of the modern county being Saxons like those in modern Surrey (Fig. I). Probably the whole area up to the west bank of the Medway was included in this Saxon province, the ancient name of which, O. E. Suiher-Gey meant the 'Southern District (German G##), presumably of the Middle Saxons. Not until the seventh century was there much contact between the Cantware and the Suthrige: certainly the Cantware seem to have kept to themselves the wealth which accrued to them through their trade and other connexions, overseas. It seems likely, therefore, that the addition of ceaster, "castle*, to Hrofi, (Germanic corruption of Durobrivae) was more than conventional, and that to the people of Kent Rochester was indeed a fortress, guarding as it did the main point of entry from the west into their prosperous little kingdom. At the Synod of Hertford in 673, Rochester was described as a castellum*. Though much smaller than Canterbury, it ranked as the second town in Kent and, when St. Augustine made Justus bishop there in 604, it became the second oldest episcopal see in England. Up to the present, there has been little opportunity of major excavation in Rochester (Fig. 2). Of the Roman town, little is known except the circuit of the