Chemical Composition: Disc
XRF data from Tracer
Alloy: Bronze
Alloying Elements: copper, tin
Other Elements: lead, iron, antimony
XRF data from Artax 2
Alloy: Bronze
Alloying Elements: copper, tin
Other Elements: lead, zinc, iron, silver, antimony, arsenic
Loop
XRF data from Artax 2
Alloy: Bronze
Alloying Elements: copper, tin
Other Elements: lead, zinc, iron, silver, antimony, arsenic
Small openwork disc
XRF data from Artax 2
Alloy: Bronze
Alloying Elements: copper, tin
Other Elements: lead, zinc, iron, silver
K. Eremin, January 2014
Technical Observations: The patina on the disc is dark brown with some areas of bare metal exposed. The surface was probably stripped of green corrosion products using an electrolytic process, leaving bare metal and a thin dark patina. The patina on the top and bottom of the wheel-shaped attachment is different from the disc, which is a matte dark brown. The very fine concentric lines on the exterior may result from the method of manufacture rather than being added decoration. There is a small chip out of the edge on one side.
The thinness of the two circular sheets indicates they were probably formed by hammering. The central hemisphere cap is hollow, and the retaining pin, which holds the assembly together, is visible at the center of this cap. The pin has an integral eyelet at the back, which would have served as an attachment point. The small pierced holes were punched from the front, and broad deformations at the back around each hole are the result of pressure from this punching. The L-shaped holes were punched from the back with a circular punch (4 mm in diameter). A saw or other similar cutting device was then used to enlarge this hole and give it rectilinear, rather than circular, boundaries. Fine incised lines in most areas not pierced follow very smooth arcs and must have been impressed while the disc was turned slowly on a wheel device.
Henry Lie (submitted 2011)