Compound lever sudden movement of the key. The earliest remaining writings regarding levers date from the 3rd century BC and were provided by Archimedes. ""Give me a place to stand, and I shall move the earth with a lever"" is a remark attributed to Archimedes, who formally stated the correct mathematical principle of levers (quoted by Pappus of Alexandria). The idea of the compound lever is attributed to the Birmingham inventor John Wyatt in 1743, when he designed a weighing machine that used four compound levers to transfer a load from a weighing platform to a central lever from which the weight
World Enough and Time (Doctor Who) and riveting", stating that the conversion of Bill Potts into the Mondasian Cyberman and the revelation at the end of the episode "packed more punch" than Jackie Tyler's Cyber-conversion in the second series or Oswin Oswald being revealed as a Dalek in the "Asylum of the Daleks". Mulkern ended his review with praise towards the cliffhanger ending: "The close of World Enough and Time is sublime. Steven Moffat’s script deftly cuts between two scenes of revelation, expertly shot by director Rachel Talalay." World Enough and Time (Doctor Who) "World Enough and Time" is the eleventh and penultimate episode of the