In 1749, the year of Du Châtelet's death, she completed the work regarded as her outstanding achievement: her translation into French, with her commentary, of Newton’s Philosophiae Naturalis Principia Mathematica (often referred to as simply the Principia ), including her derivation of the notion of conservation of energy from its principles of mechanics. Published ten years after her death, today Du Châtelet's translation of the Principia is still the standard translation of the work into French. Indeed, her translation and commentary of the Principia also contributed to the completion of the scientific revolution in France and to its acceptance in Europe. 
A windy bright Sunday morning saw a closely fought battle between these two teams, Southwell took advantage of an error in the first minutes of the game with Henry Eastgate picking up the ball and coolly slotting home. Southwell then had the lions’ share of possession but couldn’t find a second goal. Then just on the stroke of halftime Eastwood scored to level the scores. The wind strengthened in the second half and played a big part in the way the game unfolded with Eastwood using it to full advantage. Southwell scored a second from a great free kick only for it to ruled out for offside. Southwell had several further chances to win the game but didn’t capitalise. Eastwood scored a second goal from long range. Southwell continued to push hard for an equaliser and had a great chance in the final minutes but the shot went wide.