1 June 1923
First published: 1 June 1923
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ACTION OF SULPHURIC ACID ON CONCRETE.
Concrete for leaching tanks in the copper industry, or in any industry where sulphuric
acid is used, will always be an unfavourable consideration. Sulphuric acid, attacking the component parts of the cement used in the concrete, breaks them down into sulphates, this action causing the concrete to soften, and go to pieces within a year.
During the last few years the Council of the thriving and growing Swedish seaport of Helsingborg has voted considerable sums for the extension of its harbour and the improvement of the facilities for visiting ships. Among the structures erected the 1,100 ft. long breakwater, extending from the old moles, and partly enclosing a new harbour basin, is the most conspicuous, and a short description of its design and construction might perhaps be of general interest.
Trade Guilds, technical institutions, professional associations, and learned societies
appear to have existed in some form or other through all the changing periods of recorded history.
E. Fiander Etchells