[1900]. Is a variety of [No. 1896], with tandem cylinders and two cranks for triple expansion.

[1901]. Is also a variety of [No. 1898], with tandem cylinders for triple expansion. In this plan the intermediate stuffing box is got rid of by using two piston rods to the lower cylinder, coupled to the piston rod of the upper or high-pressure cylinder by a crosshead.

[1902]. Compound overhead standard engines, for twin screws.

[1903]. Diagonal twin screw engines.

[Larger plate.]

[1904]. Horizontal twin screw engines.

[1905]. Plan of cylinders as usually employed for [No. 1902].

[1906]. Oscillating paddle engines, sometimes made with cylinders at 90° apart and a single crank, as [No. 564].

[1907]. Overhead oscillating twin screw engines.