Henry Jaques described the feather with 4 steps RLRL,SQQS (I shall use man's step throughout), and the three step as RLR, QQS, but he confused things by stating the starting position for all figures as "feet together".
For amalgamations he used two terms "followed by" and "into" where into meant the last step of one figure became the first step of the next.
He thus described "feather step, into reverse turn, followed by three step, into natural turn".
For me, Guy Howard has the most logical description which removes all overlap. He describes a feather as 3 steps RLR,SQQ and the three step as LRL,SQQ.
As regards learning from the book, please bear in mind that is not the aim of the books. They are intended as a technique manual against which a teacher may be examined. As such it is often necessary to include some action following a figure to demonstrate that the teacher is aware of the need to complete lowering, recover sway, regain alignment or to take the following step in an OP position.