The first picture screened showed the reduction of copper from the large commercial sizes to small diameters. This is done by drawing the wire through a series of steel or diamond dies. Each die in the series reduces the size slightly.
After drawing, the wire must be annealed after which it is coated with tin in order to prevent corrosion. Before tinning, the coils of wire have to be pickled or dipped in baths of acid to make them thoroughly clean and to remove all oxide. The coils are sprayed with water to remove all trace of acid and are then thoroughly dried by an air blast. After this the wire must be rewound.
Having seen the process necessary for the making of copper suitable for turning into electric wires, they came te insulation.
Large cocoon. shaped slabs of rubber are exported from Para in South America where (on account of the age of the trees) the rubber is of a better quality than- can yet -be obtained in the Malay States. Great attempts have been
Text read from the printed page and cleaned; old type leaves the occasional error.