Traditionally, the score book might record each ball bowled by a bowler and each ball faced by a batsman, but not necessarily which batsman faced which ball. Linear scoring systems were developed from the late 19th century and early 20th century by John Atkinson Pendlington, Bill Ferguson and Bill Frindall, to keep track of the balls faced by a batsman off each bowler. Another early method of recording the number of balls faced and runs scored by each batsman off each bowler was devised by Australian scorer J.G. Jackschon in the 1890s, using a separate memorandum alongside the main scoresheet.