Heel-ball. A preparation of wax used by shoemakers, in the form of a ball, in burnishing the heels of shoes.
Head cap. The fold of leather over the headband.
Imitation Russia. See Cowhide.
Imperial morocco cloth. A grain-finished linen-thread cloth manufactured by the Winterbottom Book Cloth Company of England. It is made in different colors; of these the library has tried but one, the green. On books which have some, but not constant use, it is a very good substitute for leather. It takes lettering well, and wears better than any of the cloths the library has tried. The price is 48 cents per square yard by the roll, fast color, duty paid. (De Jonge & Co., 69–73 Duane St., New York.)
In boards. When a book is cut after the boards are affixed to form the sides, it is said to be cut in boards. The term is also applied to a style of binding in which the boards are covered with paper only.
Inset. When one sheet is placed inside of another, both being folded.
Inside margins. The border made by the turn in of the leather on the inside of boards.
Inside tins. Sheets of tin; so called from being placed inside the boards when a book is put in the standing-press.
Jansen style. Without line or ornament either in blank or gold. It permits decoration on the inside cover, but demands absolute plainness on the outside, with the exception of lettering. It is only appropriate for crushed levant, it being dependent for its beauty on the polished surface of the leather.