Book pocket. A pocket made of paper, generally pasted on the last fly-leaf to hold the book card when the book is on the shelf, or to hold the reader's card when the book is borrowed.
Bosses. Metal ornaments fastened on the boards of books.
Broken. 1. Paper folded over. 2. The back of a book which has been cracked open from head to tail is broken.
Broken up (or over). Plates are broken up when they are folded over a short distance from the back before being placed in the book.
Burnish. The gloss produced by the application of a burnisher to the edges of a book.
Burnisher. Piece of agate or blood-stone set in handles and used to produce a gloss on the edges of books.
Calendered paper. Paper with a highly polished surface.
Cancels. Leaves containing errors which are to be replaced with corrected pages. The replacements are frequently marked with an asterisk.
Canvas. Same as duck. See page 80.
Caps. Coverings which protect the edges of books during the processes of covering and finishing.