A good theory – while it lasted

First published in 1687, in Latin, the ideas contained within ‘Philosophiæ Naturalis Principia Mathematica’ are better known as Newton’s Laws of Motion. These laws work extremely well in most cases. Over time, certain minor discrepancies began to be noticed. For example, the orbit of Mercury does not quite accord with the theory. Einstein came up…

Labourer to hairdresser

The fact that Patrick is missing from the 1921 census (see The Irish Pimpernel) is doubly frustrating due to the amount of information recorded on that occasion. The occupation and place of employment are both part of the census return. For example, his brother-in-law Ernest Delves worked as a Suction Gas Plant Attendant at John…