Page:The Art of Bookbinding, Zaehnsdorf, 1890.djvu/43

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collate, is to ensure that each sheet or leaf is in its proper sequence. Putting the sheets together and placing plates or maps requires great attention. The sheets must run in proper order by the signatures: letters are mostly used, but numbers are sometimes substituted. When letters are used, the alphabet is repeated as often as necessary, doubling the letter as often as a new alphabet is used, as B, C, with the first alphabet, and AA, BB, CC or Aa, Bb, Cc, with the second repetition, and three letters with the third, generally leaving out J, V, W. Plates must be trimmed or cut to the proper size before being placed in the book, and maps that are to be folded must be put on guards. By mounting a map on a guard the size of the page, it may be kept open on the table beside the book, which may be opened at any part without concealing the map: by this method the map will remain convenient for constant reference. This is technically called "throwing out" a map.

To collate a book, it is to be held in the right hand, at the right top corner, then, with a turn of the wrist, the back must be brought to the front. Fan the sections out, then with the left hand the sheets must be brought back to an angle, which will cause them when released to spring forward, so that the letter on the right bottom