Editing Dalek (section)

====Movement====
Terry Nation's original plan was for the Daleks to glide across the floor. Early versions of the Daleks rolled on nylon [[Caster|castors]], propelled by the operator's feet. Although castors were adequate for the Daleks' debut serial, which was shot entirely at the BBC's [[Lime Grove Studios]], for ''The Dalek Invasion of Earth'' Terry Nation wanted the Daleks to be filmed on the streets of London. To enable the Daleks to travel smoothly on location, designer Spencer Chapman built the new Dalek shells around miniature [[tricycle]]s with sturdier wheels, which were hidden by enlarged fenders fitted below the original base.<ref>Howe (1997), pp. 84–85</ref> The uneven flagstones of Central London caused the Daleks to rattle as they moved and it was not possible to remove this noise from the final soundtrack. A small parabolic dish was added to the rear of the prop's casing to explain why these Daleks, unlike the ones in their first serial, were not dependent on [[static electricity]] drawn up from the floors of the Dalek city for their motive power.<ref name="Monsters_85" />

Later versions of the prop had more efficient wheels and were once again simply propelled by the seated operators' feet, but they remained so heavy that when going up ramps they often had to be pushed by stagehands out of camera shot. The difficulty of operating all the prop's parts at once contributed to the occasionally jerky Dalek movements.<ref name="Monsters_85" /> This problem has largely been eradicated with the advent of the "new series" version, as its remotely controlled dome and eyestalk allow the operator to concentrate on the smooth movement of the Dalek and its arms.<ref>Russell (2006), p. 163</ref>