- over ▁not ch ▁on ▁the ▁ring ▁of ▁I ▁comes ▁to ▁the ▁sens ing ▁point , ▁II ▁is ▁caused ▁to ▁move ▁on ▁when ▁the ▁next ▁letter ▁is ▁key ed ▁( as ▁with ▁En igma ). ▁ ▁When ▁the ▁turn - over ▁not ch ▁comes ▁to ▁the ▁sens ing ▁point ▁of ▁II , ▁II ▁turns ▁on ▁one ▁place ▁when ▁the ▁next ▁letter ▁is ▁key ed ▁( at ▁the ▁same ▁time ▁as ▁III , ▁as ▁with ▁the ▁double ▁step ▁on ▁En igma ) ▁ ▁If ▁any ▁of ▁these ▁three ▁causes ▁of ▁movement ▁take ▁effect ▁simultaneously ▁on ▁II , ▁it ▁never theless ▁only ▁moves ▁on ▁one ▁place . ▁There ▁are ▁three ▁causes ▁of ▁movement ▁for ▁wheel ▁III . ▁ ▁An ▁active ▁pin ▁at ▁the ▁sens ing - point ▁of ▁N 3 ▁causes ▁III ▁to ▁move ▁to ▁one ▁place , ▁as ▁in ▁the ▁first ▁a ) ▁above , ▁▁ ▁When ▁the ▁turn - over ▁not ch ▁on ▁the ▁ring ▁of ▁II ▁comes ▁to ▁the ▁sens ing ▁point , ▁III ▁moves ▁on ▁one ▁place ▁when ▁the ▁next ▁letter ▁is ▁key ed . ▁ ▁Just ▁as ▁in ▁the ▁case ▁of ▁II , ▁if ▁the ▁two ▁causes ▁of ▁the ▁movement ▁for ▁III ▁operation ▁simultaneously ▁the ▁combine ▁to ▁produce ▁one ▁stop . ▁Working ▁on ▁En igma ▁w iring . ▁All ▁the ▁p ins ▁of ▁N 1 ▁are ▁set ▁at ▁active , ▁the ▁p ins ▁of ▁N 2 ▁and ▁N 3 ▁all ▁remaining ▁in active . ▁Then ▁the ▁movements ▁identical ▁with ▁that ▁of ▁the ▁En igma . ▁As ▁all ▁other ▁factors ▁also