Valve-gears

Stephenson's link motion

Each slide valve is equipped with two eccentrics, one for ahead and another for astern. By shifting the position of a quadrant you can get one or the other of the eccentric rods to operate the slide valve rod. A steamer with Stephenson's link motion have the slide valves placed at the engines ends and/or between the cylinders and therefore the engine is longer than if it had had horizontal eccentric rods and hence the slide valves located on the side of the steam engine as they are on engines with Kluge's, Flodman's, and Hackworth's valve-gear.

Steamship with Stephenson's link motion

Hackworth's valve-gear

Hackworth's valve-gear has horizontal eccentric rods with its small end connected to a cube that runs a guide. The eccentric rod center is with a link connected to slide valve rod. Changing the angle of the guide rails changes the engine's rotation.
Hackworth's valve-gear was a precursor to Klug's valve-gear. Hackworth's valve-gear is probably more common in locomotives than in steamships.

Steamship with Hackworths valve-gear

Klug's valve-gear

Klug's valve-gearhas a horizontal eccentric rod suspended in a pendulum and the eccentric rods end is by means of a link connected to the slide valve rod. Changing the pendulums suspension point changes the engine's rotation.

Steamship with Klug's valve-gear

Flodman's valve-gear

Flodman's valve-gear has a horizontal eccentric rod suspended in a pendulum and it works the same as the Klug's valve-gear, but the pendulum and the link to the slide valve rod have swaped places. However, the mechanism that moves the pendulums suspension point, is quite differently. Could it be a patent issue?
Flodman's valve-gear seems to be most common on Swedish steam engines.

Steamship with Flodman's valve-gear

Carlsund's thread

The crankshaft is provided with longitudinal slots. A casing, yellow on the picture, connected to the eccentric is provided with thread-like slots. An outer axially movable casing with a number of concentric rings is provided with blocks, blue on the picture, that slide in the slots of the eccentric-casing as well as the slots of the crankshaft. A pinion moves the outer casing axially, as a rack gear, and that movement turns the eccentric on the crankshaft and the engines rotation reverses.     Steamboat with Carlsund's thread