One-legged stools | Mercia mudstone | Dying by fish | Lancia automobiles | Naming your chilly
All this dialogue in regards to the relative design and deserves of three-legged stools (Letters passim) is as nothing in contrast with the so-called suicide stool, a one-legged stool designed by Alfred Nobel to forestall operators of the nitroglycerin response vats – a part of the manufacturing technique of his dynamite – falling asleep and permitting an exothermic runaway to happen, with the resultant explosion ruining everybody’s day.
Thornton Cleveleys, Lancashire
• Graham Thompson must be cautious referring to the Keuper marl rock formation as a defining “north/south” function (Letters, 21 October). I used to be lately admonished by a geology skilled for utilizing this time period. “We now name it Mercia mudstone,” I used to be instructed. However marl or mudstone apart, north of the Trent is True North.