Abstract: An indexible turret delivers successive stacks of a series of stacks of overlapping paper sheets to an adhesive applying or coating station where the elongated spine of a freshly delivered stack assumes a predetermined position. An elongated carriage is movable longitudinally of the spine at the coating station and carries two mirror symmetrical nozzles one of which is activated to supply a coat of adhesive to the spine at the coating station while the carriage moves in one direction and the other of which is activated to apply a coat of adhesive to the spine of the next stack of the series while the carriage moves in the opposite direction. The nozzles have elongated slots extending transversely of the spine at the coating station, and each nozzle is mounted in a discrete frame and is adjustable in and/or with such frame transversely of as well as toward and away from the spine at the coating station.