Abstract: Apparatus for providing various different lines of perforations in a paper sample for use in a testing apparatus. The perforating apparatus includes a replaceable blade mounted on a base. A roller is mounted on the base for movement along the blade. Means are provided for adjusting the pressure applied by the roller to the paper sample disposed between the blade and roller.

Abstract: Apparatus for testing the fitness of the multiple copy sets for handwritten copies. The form set to be tested is placed on an inclined supporting plate and is clamped to the supporting plate by a slotted hold down plate. A writing instrument, which includes a spring loaded writing implement, is carried by a carriage so that the tip of the writing implement contacts the form set through the slot. The carriage is movable so as to move the tip of the writing instrument along the slot. The writing implement is supported so that the tip contacts the form set substantially without pressure in a starting position. As the carriage is shifted in the direction of increasing ascent of the supporting plate the bearing pressure of the tip of the writing implement increases as a function of the path of travel. The test line produced on the different sheets of the set is a measure of the quality of the copies.

Abstract: A method of and apparatus for measuring the flexural stiffness of a sheet like sample. The sample is placed on an obliquely positioned surface with its upper edge above a horizontal clamping line. The portion of the sample above the clamping line is of sufficient length so that when it is pivoted forward beyond the vertical the top portion of the sample is freely bent outward. The free clamping length of the sample measured between the top edge and the clamping point is then reduced until the top portion of the sample independently pivots back onto the surface. The residual clamping length thereby obtained is a measurement of the flexural stiffness.

Abstract: Apparatus for testing the burst strength of a line of perforations in a sheet of paper. The testing apparatus comprises a first means fixedly mounted in a frame for gripping a sheet of paper on one side of a line of perforations extending across the paper and a second means rotatably mounted in the frame in spaced relation to the first means for gripping the paper on the other side of the line of perforations. A pendulum is attached to the second means so that swinging of the pendulum causes rotation of the second means. The pendulum may be swung along a path which extends from a first position, where energy is stored in the pendulum, through a second position, where the paper is rendered taut and the line of perforations is burst by the energy stored in the pendulum, to a third position, where the energy remaining in the pendulum after the bursting action is dissipated.

Abstract: Apparatus for testing the print through quality of a forms set. The apparatus comprises a horizontal base plate which is adapted to have the forms set laid thereupon. Sleeve means is mounted above the base plate for guiding a hammer for vertical movement to and from a position where its face strikes the forms set disposed on the base plate. Means are provided for releasably locking the hammer at a preselected one of a plurality of heights above the forms set. A raised test sign is provided on either the face of the hammer or on the upper surface of the base plate below the face of the hammer.