Sir, – To make it useful, the standard length of a metric ruler is 30cm – one foot (October 10th). – Yours, etc, Dr JOHN DOHERTY, Cnoc an Stollaire, Gaoth Dobhair, Co Donegal.
Letters to the Editor, October 16th: On reclaiming the national anthem, the presidency and Asian hornets
Letters to the Editor, October 15th: On giving convicted people a second chance, the presidency and solid hurling
