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This further step forward can be attributed to the presence of iron oxide gossan minerals in the weathered upper zones of copper sulfide deposits.

In many regions, copper-arsenic alloys, of superior properties to copper in both cast and wrought form, were produced in the next period.

the measuring and recording of the angular oscillations of an aircraft in flight, with respect to an axis or axes flxed in space.

Metallurgy, art and science of extracting metals from their ores and modifying the metals for use.

Another step was the discovery that metals could be recovered from metal-bearing minerals.

These had been collected and could be distinguished on the basis of colour, texture, weight, and flame colour and smell when heated.

The standards for the base units, except for the kilogram, are defined by unchanging and reproducible physical occurences.

For example, the meter is defined as the distance traveled by light in a vacuum in 1/299,792,458 of a second.

In order to effect the agglomeration and separation of melted or smelted copper from its associated minerals, it was necessary to introduce iron oxide as a flux.The standard for the kilogram is a platinum-iridium cylinder kept at the International Bureau of Weights and Standards in Sèvres, France.