left undisturbed for a time period sufficient to permit hydrostatic stabilization this time period is in the order of 5 seconds from the moment of agitator a removal and is signified by a continuous reflective surface of the slurry charge at this moment the valve 13 is opened to connect the sink 11 and reservoir 20 volume to an evacuated receiving vessel not shown quiescent time periods in excess of minimums indicated are to be avoided due to undesirable settling of the suspended fibers performance of the present invention is represented by comparing the graphs of fig2 and 3 fig2 illustrates the fiber distribution characteristics of a paper handsheet molded on a prior art device of the type described herein the reference axis from which fiber angle measurements were taken was aribitrarily selected the increments of measurement were taken to both sides of the axis so that the absolute angles indicated are in plus and minus quadrants inclusive the bar graph shows a mild scattering of the fiber content relative to angular orientation but the point graph of cumulative fiber content very closely approximates a straight line as it would be if the fiber distribution laid in a true random pattern the ordinate of each cumulative point equals the sum of bar graph increment ordinates preceding it will be noted from the fig2 legend data that the average drainage rate was 1 25 liters sec fig3 illustrates the data of parameters identical to those of fig2 taken from handsheets formed by the present invention in addition data taken from paper samples laid on a full scale production fourdrinier machine is superimposed to graphically illustrate the capacity of the invention to simulate a machine laid fiber distribution pattern fig3 legend data describes an.