porous polypropylene gas screens the following results were obtained table i__________________________________________________________________________condition action voltage v __________________________________________________________________________1 flooded a open circuit 1 368 b charging 1a 1 78 c open circuit 1 658 d plus 16 hours 1 6552 semistarved w h sub 2 atm a open circuit 1 657 b discharge 1a 1 min 1 612 2 1 609 5 1 604 10 1 592 c discharge 2a 1 557 5 1 470 7 1 415 6 1 440 1 min 1 413 2 min 1 393 d 16 hours on open circ 1 64__________________________________________________________________________ following this the cell was soaked with electrolyte for a second time and the excess drained the cell was then charged at 0 17a for 3 hours and discharged at 0 25a the resultant data generated is tabulated below table ii______________________________________condition action voltage v ______________________________________ e charge 17a 1 hr 1 802 2 hr 1 824 3 hr 1 853 f discharge 25 1 hr 1 659 2 hr 1 627 3 hr 1 594 4 hr 1 000______________________________________ the cell was then charged at 0 3a for 4 hours and then discharged at 0 6 and 0 3a to exhaustion table iii below sets out the test results and fig2 displays the results table iii______________________________________condition action voltage v ______________________________________ g charge 3a 1 hr 1 861 2 hr 1 889 3 hr 1 926 4 hr 1 973 h discharge 6a 5 hr 1 618 1 0 hr 1 566 1 5 hr 1 496 2 0 hr 1 350 i discharge 3a.