According to The Granite Monthly, Volumes 50-51, Page 176:
“Sunapee, NH claims the honor of having the first inventor of a horseless carriage in the person of Enos Merrill Clough, who forty-nine years ago (at the time of publication- Editor) brought out a finished product after fourteen years of study and labor an automobile containing 5,463 pieces. The machine was propelled by its power to Newport, St. Johnsbury, Vt., Lebanon, Lancaster, Landaff and thence to Lake Village, now Lakeport, for exhibition. Although the invention was really a success, the authorities forbid Mr. Clough running it on the highways as it frightened horses. Mr. Clough became discouraged and sold the machine to Richard Cove of Lakeport, who ran it into a fence, doing considerable damage to the car. The machine was afterwards dismantled, the engine being sold to be used in a steamboat on the lake and the carriage part was afterwards destroyed by fire. This car was finished in a shop just east of our Methodist church connected with the house occupied by Mr. Clough. Mr. Clough predicted that he would live to see the streets full of horseless carriages, a Prediction which has been abundantly verified. Mr. Clough was struck by a New York machine while doing flag duty at the Lakeport R. R. crossing, and died from the injuries received August 2, 1916, in his eighty-second year.”
Note: Additionally, see this article clipping about Enos located in the old Google Newspapers. Also see here, here and here (go to page 7 of the PDF).
Bibliography
The Granite State Monthly, Volumes 50-51: Edited by Henry Harrison Metcalf and John Norris McClintock: Contributor, Otis Grant Hammond. Published by Granite Monthly Company, 1918