The Ariel was made by the Ariel Co, Boston (later Bridgeport, Connecticut) from 1905 to 1906, then Sinclair-Scott Co, Baltimore, Maryland in 1906. They were available in either air-cooled or water-cooled engines of 30 hp using a single overhead camshaft

Overhead camshaft

Overhead cam valvetrain configurations place the engine camshaft within the cylinder heads, above the combustion chambers, and drive the valves or lifters in a more direct manner compared to overhead valves and pushrods...

. The radiator

Radiator

Radiators are heat exchangers used to transfer thermal energy from one medium to another for the purpose of cooling and heating. The majority of radiators are constructed to function in automobiles, buildings, and electronics...

s were oval in shape, similar to the Delaunay-Belleville, giving rise to their slogan, ‘Look for the Oval Front.’ In 1906, the make name was changed to Maryland.