extend upwardly and downwardly the spline portions can be cut readily for conformation with an out of plumb frame the facing and gripping portions have sufficiently great cross sectional thickness to impart rigidity at least sections of the sealing portions have appropriate composition and sufficiently small cross sectional thickness to impart flexibility application_number US 33928982 A description the assemblage illustrated in fig1 comprises a frame 20 an upper window sash 22 and a lower window sash 24 frame 20 includes a header portion 26 a sill portion 28 and jamb portions 30 and 32 a cross section of sill portion 28 is shown in fig3 a cross section of head and jamb portions 26 30 and 32 is shown in fig4 upper sash 22 includes a top rail 34 a forward meeting rail 36 and a pair of stiles 38 and 40 which hold a double glass pane including an outer glass pane 42 and an inner glass pane 44 lower sash 24 includes a rearward meeting rail 46 a bottom rail 48 and a pair of stiles 50 and 52 which hold a double glass pane assemblage including an outer glass pane 54 and an inner glass pane 56 in accordance with the present invention the aforementioned components are constructed of wood that is clad with associated with extrusions which will be described in detail below the arrangement specifically is such that top rail 34.