He at once appreciated the practical value of the discovery , and started making friction matches .
While Walker was preparing a lighting mixture on one occasion , a match which had been dipped in it took fire by an accidental friction upon the hearth .
Walker at once appreciated the practical value of the discovery , and started making friction matches .
While Walker was preparing a lighting mixture on one occasion , a match which had been dipped in it took fire by an accidental friction upon the hearth .