Measuring for custom four flap enclosures:

Often works needing custom four flap enclosures are quite old and cockled making it difficult to accurately obtain a good measurement. Measure the length and the width of the book and if it is at a 16th of an inch go to the next 1/8-inch. To measure the depth or thickness of the book, lay it flat on a table. Lightly place your hand on the top cover, measure the thickness of the spine and then the fore edge by standing a ruler up on end on the table top, first against the spine and then at the fore edge. Use the measurement that is greater to create a good fit for each volume.