1895. Brown (1615).—An engine in which the beater roll and bedplate both revolve, but in opposite directions, and at different speeds in order to draw out the fibres.
1895. Schmidt (24730).—A device by means of which the pulp discharged from the beater roll is diverted into supplementary channels on either side which come together again in front of the beater roll.
1900. Hadfield (2468).—An adjustable baffle board passing through the cover of the beater roll which prevents the pulp being carried round by the roll, more or less.
1900. Masson and Scott (5367).—An improved form of Taylor beating engine in which the chest of the engine is vertical instead of horizontal.
1901. Partington (24654).—A continuous elliptical trough provided with two beater rolls.
1902. Picard (19635).—Improvements in the form of the propellers used for circulating the material.
1902. Pope and Mullen (22089).—Improvements in propellers for circulating the pulp.
1903. Annandale (26012).—A new form of beating engine somewhat on the principle of a steam turbine.
1905. Bertram (1727).—A beater similar to Masson's tower beater, but in which a pair of reciprocating wheels fitted with projecting knives are used instead of a centrifugal pump.
1907. Wagg's Jordan Engine (6788).—A conical refiner fitted with specially arranged metal or stone knives.