Model of a trunk engine, Petrus van der Loo, 1855 Canvas Print
Model of a 150 hp trunk machine or tube machine placed in a cross section of a ship. No kettle; the propeller shaft is shortened and equipped with a two-bladed parabolic screw; the machine can be turned with a crank. The model shows: two lying cylinders with tubes; condenser cabinet with four air pumps; two steam sliders with double eccentric on the crankshaft and regulator on top of the condenser; steam supply controller on extra eccentric. With this directly operating machine designed by John Penn, the piston was equipped with a round pipe, called the trunk, which protrudes through the cylinder and moves in it: the trunk replaces the piston rod and closes the cylinder. The stool is directly attached to the piston in the trunk with a pin and can move up and down with the crankshaft, while moving back and forth along with the trunk. The whole made the transmission much more compact, so that the machine could be placed in the width of the ship.
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