Designer: J P Bertinat
(ME Vols. 163-165). A twin-cylinder marine steam engine with variable bore and slide or piston valves.
Sheet 1. General arrangement, base (two versions), cylinder block (common), crankshaft, bearings, valve gear (piston and slide), reverser, flywheel, pistons, piston rods, eccentrics, connecting rods, trunk guides trunks.
Sheet 2. Suggested set-ups for various operations. Alternative crankshaft, piston valve engine, reversing arrangements and pipework for piston valve version, boiler feed pump.