bulk density b d and for flexural strength s are tabularized for the ten measuring samples n 10 evaluated for each electrode at the specified distance from the small end of the electrode table iv______________________________________strength and density properties of control vs treated electrode distance fromelectrode small end of b d n 10 s n 10 24 34 u00d7 72 34 electrode gm cc psi ______________________________________control 8 34 max 1 718 1797 min 1 680 968 avg 1 699 1436treated 8 34 max 1 730 1956 min 1 712 1485 avg 1 720 1789control 22 34 max 1 715 1792 min 1 690 1034 avg 1 701 1510treated 22 34 max 1 730 1977 min 1 710 1670 avg 1 721 1804control 32 34 max 1 722 1897 min 1 686 1331 avg 1 704 1565treated 32 34 max 1 733 2099 min 1 707 1146 avg 1 717 1781control 41 34 max 1 719 1855 min 1 686 1262 avg 1 705 1560treated 41 34 max 1 737 2151 min 1 713 1686 avg 1 723 1822______________________________________ referring to fig1 through 8 and table iv it will thus be seen that the strength and density properties of the treated electrode d exceed the corresponding properties of the control electrode c it will also be noted that all properties show some deterioration in going from the surface to the axis of the electrodes the phenomenon appearing to be slightly more pronounced at mid length than at the ends of the electrodes it will at the same time however be evident that such phenomenon is less pronounced in the treated electrode than in the reference stock thus it is seen that the present invention not only yields greater strength and density.