A two-page installment of a series on loom fixing, describing the multiplier motion used on gingham box looms. It explains how interchangeable cams let one bar of the pattern chain serve for 8, 12 or 24 picks, and how chain bars are built to operate the shuttle boxes. It also covers the parts of the mechanism (pawls, sprockets, tipping lever, pawl lifter) and begins the procedure for setting the pattern cylinder.