Lancaster Pike, Wynnewood, Pa., made dustless with “Tarvia B' 
Durable Roads 
The Tarvia, or tarring process of making macadam roads dust-proof, is almost as standard 
today in America as it is in France. Oils and water-mixtures which keep down the dust after it 
is formed are now giving way to tar which prevents the development of dust. 
Tarvia is applied in' liquid form and hardens after it has penetrated the too surface — ^forming 
an elastic, waterproof blanket over the whole road. Macadam so treated is dust-proof. For the 
entire season it will resist the wear of automobile travel without pulverizing and, except in 
extreme cases, without sprinkling. 
“Tarvia B,” the new Tarvia material, can be economically applied cold from a sprinkler 
after the manner of oil. The road is cleaned beforehand, and receives a sprinkling of sand after- 
wards. Such treatment costs about $300 a mile to apply, and not only acts as a binder, but 
makes the road shed water instead of absorbing it. Hence the frequently renewed top layer of 
fine crushed stone or sand which is now used may be dipensed with on macadam roads that 
have been treated with “Tarvia B.” The unprotected i>^-inch stone will present in some cases 
a rougher and less sightly surface than the usual screenings, but the fine stone or sand is the 
source of much dust, and cannot be kept on the road, whereas the larger stone will not produce 
dust and will endure much longer. 
For the finest macadam roads, in parks and boulevards for instance, and for new roads, we 
recommend “Tarvia A,” or the heated treatment. This heating requires some extra labor and 
expense, but it makes the ideal binder for a top dressing and the finished road will resemble 
asphalt in appearance and character and presents dustless macadam at its best. 
Booklets on request. 
Barrett 
Manufacturing Company 
Philadelphia Boston Minneapolis Cleveland 
Pittsburg- Kansas City New Orleans London, Eng. 
