opening at 17 the rotors 1 or 2 will be required to operate at higher rotational speeds and higher intensity turbulence will be created via higher shear between the traveling cavities 11 and the internal housing 3 this inherent action is extremely desirable for existing papermachines where at a given stock consistency larger slice openings are required for heavier basis weight papers and particularly for the slower operating machines which have reduced agitation in the forming section and thus generally poorer formation fig2 illustrates a typical installation of the headbox as it appears from a top view and shows the lobed rotors 1 2 extending the full width of the headbox with at least one of the rotors connected to an external drive means the manifold distributor system 10 is connected to the headbox 5 via a series of rows of pipes 30 and in the embodiment shown consists of a tapered manifold although any other conventional type of manifold could be used referring further to fig2 it may be seen that the paper making stock indicated by the letter p flows from a suitable supply not shown into the tapered manifold 10 the dilute paper stock is then subjected to a flow division wherein a portion flows through each of the series of pipes 30 connecting the manifold 10 and the headbox 5 then because of the.