This section is from the book "Spons' Mechanics' Own Book: A Manual For Handicraftsmen And Amateurs", by Edward Spon. Also available from Amazon: Spons' Mechanics' Own Book.
Everything depends on adapting the height of the springs and adjustment of the stuffing to the particular character of the chair. A good rule is to keep the stuffing well to the front of the seat, in order to give it a decided throw back. The swell in the back must be regulated so as to catch the small of the back of the sitter, and not to throw the shoulders or the bottom of the spine too much forward. It is well to avoid making the stuffing very full, consequently 1 1/2 or 1 3/4 in. will suffice for each diamond, that is to say, if the diamonds on the scrim are 7 in. by 5 in., the skin may be marked 8 3/4 in. by 7 3/4 in. Easy chairs are much best without buttons, especially in leather.