The exact date of his discovery , according to his own statement , was October 1829 .
Two and a half years after Walker 's invention was made public , Isaac Holden arrived , independently , at the same idea of coating wooden splinters with sulphur .
The exact date of Walker 's discovery , according to Walker 's own statement , was October 1829 .
Two and a half years after Walker 's invention was made public , Isaac Holden arrived , independently , at the same idea of coating wooden splinters with sulphur .