This section is from the book "Spons' Mechanics' Own Book: A Manual For Handicraftsmen And Amateurs", by Edward Spon. Also available from Amazon: Spons' Mechanics' Own Book.
Here again the article used by carpenters (Fig. 260, p. 188) is replaced by a shorter form more suited to light work. It is made by screwing together 2 pieces of Bay mahogany 30 in. long, 6 in. wide, and 1 in. thick, one overlapping the other 2 in. sideways, so as to form a step 4 in. wide. This constitutes the shooting board. The mitring is effected by a triangular piece screwed to the top board, about the centre, with its apex touching the margin of the step, so that its sides form exactly angles of 45° with the step.