Carey’s Wood Pavement.
—In this case the blocks are cut 4 inches wide by 9 inches long, and 5 or 6 inches deep, according to the traffic; these blocks are shaped with alternate convex and concave ends, and are laid on a bed of sand about 2 inches thick, the joints between the blocks, which have been left about ³⁄₈ inch wide, being filled with a grouting of lime and sand.
Messrs. Mowlem and Company’s
method of laying wood paving is to form a foundation of concrete, varying in thickness according to the nature of the subsoil and the traffic; then to pave with blocks of yellow deal, 3 inches wide and 6 or 7 inches deep; the joints, which vary from ³⁄₈ to ¹⁄₂ inch, are filled in with sand and lias lime, and the surface is afterwards indurated by strewing it with shingle.
Patent Ligno-Mineral Paving Company.
—This company lays claim to the speciality of using hard woods as well as pine, and that the pine blocks they employ are preserved or mineralised so as to be more durable than the wood in its natural state.[71]
Nicholson’s Wood Pavement.
—This is principally in use in the United States, and consists of rectangular blocks of pine laid upon a close flooring of pine boards, 1 inch thick, laid lengthwise with the line of street, their ends resting on similar boards laid transversely from kerb to kerb, the boards being thoroughly tarred and laid upon a bed of sand. The joints of the wood blocks are run with an asphaltic mixture, and the whole surface is finally covered with hot coal tar and sprinkled with fine sand and gravel.
Stowe’s Wood Pavement.
—This is also American, the blocks resting directly upon sand or gravel about 6 inches in thickness.[72] “The blocks are set in courses transversely across the street, so as to break joint lengthwise of the street, the courses being separated from each other 1 inch by a continuous course of wooden wedges placed close together edge to edge, and extending from kerb to kerb. These wedges are set in the first instance with their tops flush with the top surface of the blocks. After the whole pavement shall have been well rammed, so as to give each block a firm bed, the wedges are driven down about 3 inches, and the open joints thus formed above them between the courses are filled in with a concrete composed of hot coal tar and fine roofing sand and gravel. The surface of the pavement may then be coated with coal tar prepared by boiling with pitch, and finished off with a thin layer of sand.”