Cunningham Steam Wagon

The firm was established in December 1900, with the intention of manufacturing the products that the Cunningham Engineering Company of Boston, Massachusetts, planned to develop.

However the truck was supplied with a valve that could convert the compound working to all cylinders receiving full high pressure.

[2] The engine shaft was common to both power units, running across the full width of the vehicle.

[6] The engine shaft was furnished with a 4+1⁄2-inch (110 mm) pinion which engaged with gears on the two hydraulic clutches.

The clutches were operated by water pressing upon a rubber diaphragm which drove the friction surfaces together.

[9] The boiler was a vertical water-tube type, 4 feet (1.2 m) high and 25 inches (640 mm) in diameter.