(1) Schedule 1 to the principal Scheme shall be amended in accordance with the following provisions of this article.
(2) At the end of the entry in the second column relating to disease number 4 (primary neoplasm of the epithelial lining of the bladder etc. ) there shall be added the words
(d) exposure to coal tar pitch volatiles produced in aluminium smelting involving the Soderberg process (that is to say the method of producing aluminium by electrolysis in which the anode consists of a paste of petroleum coke and mineral oil which is baked in situ).
(3) The description of disease number 9 shall be amended by substituting for the words “Lung cancer” the words “Primary carcinoma of the lung”.
(4) After the entry relating to disease number 9 there shall be added the following entry—
Exposure to silica dust in the course of—
the manufacture of glass or pottery;
tunnelling in or quarrying sandstone or granite;
mining metal ores;
slate quarrying or the manufacture of artefacts from slate;
mining clay;
using siliceous materials as abrasives;
cutting stone;
stonemasonry; or
work in a foundry.