Abstract: A folded report cover is provided with a lock strip extending along at least one side of the cover parallel and contiguous to the fold and outwardly of the plane of the side. A channel-shaped gripping member is engaged to the cover along the fold and locked in place by a stop which extends from the interior of one leg of the gripping member into resilient engagement with a longitudinal edge of the lock strip and the one side of the cover. The other leg of the gripping member engages the opposite side of the cover. The lock strip is preferably an integral portion of the material of the cover.

Abstract: An apparatus and method for determining the percentage of solid particles in a suspension (consistency) is provided. A source of diffused radiant energy is provided which energy is directed toward a suspension to be measured. The portion of the energy which is forward-scattered by the suspension is detected and a first signal indicative of the magnitude of the forward-scattered energy is produced. The portion of energy which is back-scattered by the suspension is detected and a second signal indicative of the magnitude of back-scattered energy is produced. The first and second signals are combined at a predetermined ratio to produce a feedback signal used to control the intensity of energy emitted from the radiant energy source. The intensity of energy emitted from the source is a function of the forward-scattered and back-scattered energy and is directly proportional to the consistency of the suspension being measured.

Abstract: A regenerative heat exchanger wherein the rotor-to-shaft connection includes axially spaced annuli fixed about the shaft and rigidly secured to the radial partitions of the rotor.