the stock which enters the wedge zone defined by the converging portions of the opposed wire runs from the roll 55 to the deflector 90 will be subject to compression between the converging wire runs and the resulting expression of liquid through both wires this action will be accentuated as the sandwich of wire stock wire travels past the deflectors 71 and 90 to the second deflector 120 for the top wire which will be a relatively flat s course with the deflectors positioned as described formation is therefore completed before this sandwich passes deflector 20 and immediately thereafter the top wire 22 is guided upwardly by the roll 56 while the newly formed sheet is held on the primary wire 13 by the suction box 150 for travel to and beyond the couch roll 12 in the usual way the resulting sheet will have the unique characteristic of including a strip formed by twin wire operation which is integral with sheet formed by the conventional single wire technique the two types of sheet are easily compared after the usual pressing and other finishing operations in order to determine the differences therebetween which can be expected to include distinctly improved characteristics from the standpoint of reduction of two sidedness the apparatus of the invention thus makes it easy for a paper mill to determine whether the results achieved by top wire formation justify conversion of a particular conventional machine to top former operation it also makes it possible to investigate different combinations of deflector spacings and the initial angle of convergence of the opposed forming runs of the two wires as well as different speeds of operation all of these advantages are made available with no modification of the existing paper machine and therefore.