On July 26m 1904, Degar Oyrbell Hooley received U.S. Patent No. 765975 on an Apparatus for the Preparation of Tar Macadam.

Tarmacadam or tarmac is a road surfacing material made by combining tar and macadam (crushed stone and sand). It is more durable and dust-free than compacted stone macadam invented by Scottish engineer John Loudon McAdam. Today “tarmacadam” and “tarmac” are also used for a variety of other materials, including tar-grouted macadam, bituminous surface treatments and modern asphalt concrete.