Bal Maidens 'Spalling’. Ilustration from ‘Proceedings of the Institution of Civil Engineers’, James Henderson, 1858. www.balmaiden.co.uk/balmaidengallery

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Bal Maidens 'Spalling’. Ilustration from ‘Proceedings of the Institution of Civil Engineers’, James Henderson, 1858. www.balmaiden.co.uk/balmaidengallery