MICHIGAN ROADS AND FORESTS 



5 



more liquor was added until at the last the 

 solution consisted of. equal parts of liquor 

 and water. This increase in strength was 

 found necessary in order to secure a more 

 viscous liquor, and thus prevent it from run- 

 ning off the road. It was also found neces- 

 sary to roll the road shortly after sprinkling 

 as otherwise the surface become so sticky 

 that it picked up under the roller. After ap- 

 plying about 1 gal. of the liquor per sq. yd. 

 a very smooth surface was produced but in a 

 few days it cracked and blistered to a depth 

 of an eighth of an inch. The material below 

 was solid and the section was sprinkled and 

 rolled again, leaving the surface in good con- 

 dition but not as smooth as it had been be- 

 fore. 



In experiment No. 7 the first course was 

 placed as in Xo. 1. The second course was 

 laid 4 ins. deep and consisted of a mixture 

 of 3 parts of blast furnace slag from 1J4 ins. 

 to % in. in size and one part of slag varying 

 from J^ in. to dust, the whole mixed with 

 about 6 per cent, of refined coke oven tar 

 having a specific gravity of 1.217. The slag 

 was heated in a large pan until dry and warm 

 to the hand, the two sizes occupying opposite 

 sides. It was then mixed on a board and the 

 tar, which had been heated in a 2-barrel pot, 

 was poured over the slag and the whole thor- 

 oughly mixed. The mixture was spread upon 

 the road, and flushed with tar by means of 

 sprinkling cans. About % gal. per sq. yd. 

 was applied in this manner, making with that 

 contained in the mixture, a total of about 

 \ l /2 gals. A thin coating of slag, from ^g in. 

 to dust, was then spread over the surface and 

 lolled in. The report states that at the last 

 inspection in the fall of 1909, the section was 

 in excellent condition. 



ASPHALTIC OIL FOR SANDY ROADS. 



A significant feature of the annual conven- 

 tion of the American Road Builders' Associa- 

 tion in Indianapolis, Dec. 6 to 9, was a paper 

 by Harold Parker, chairman of the Massachu- 

 setts highway commission. Mr. Parker, one 

 of the great road building authorities in the 

 entire world, went on record in declaring that 

 it i ? now possible to build roads which will 

 resist automobile wear and make the annual 

 repair per mile less than it was before the 

 automobile came among us. His paper at- 

 tracted great attention at the meeting and it 

 now being commented upon in every part of 

 the globe where good roads and automobiles 

 exist. 



Mr. Parker spoke of several of the modern 

 methods for making roads withstand the au- 

 tomobile strain. One was a bituminous sur- 

 face treatment for macadam roads and also 

 asphaltic oil to be used in the same manner. 

 On Cape Cod, according to the Massachusetts 

 expert, they have and are building roads in 

 the sand by coating the sand with several lay- 

 ers of asphaltic oil and harrowing it in until 

 it gets three or four inches thick. These 

 roads have proven admirable for automobile 

 travel. During the resort season, upwards of 

 600 autos run over them each day, not to men- 

 tion the many other conveyances, notably 

 farm traffic, and yet in the last six years, no 

 repairs have been made on these roads. 



Deputy State Highway Commissioner Rog- 

 ers is of the opinion that the sandy districts 

 of Michigan, especially in the sand dunes of 

 the western part and in northern portions of 

 the upper peninsula, may be benefited by the 

 latest discoveries. 



Presert/es 





Preserving Macadam 



A dusty macadam road indicates that 

 the road is wasting away because it is 

 incapableof withstanding modern traffic. 

 It indicates that material which has 

 been carted laboriously and put upon the 

 roadway at great expense, is being 

 rapidly distributed over the landscape, 

 necessitating expensive renewal in the 

 near future. 



It further means that macadam as or- 

 dinarily constructed was never designed 

 to withstand heavy automobile traffic. 

 To attempt to maintain it under such 

 traffic is only to waste money. 



The Tarvia Process of road preserva- 

 tion and dust prevention is now widely 

 known. It has been successfully used 

 upon millions of yards of roadways, and 

 is recognized as a decided step forward 

 in the science of road building. 



Tarvia is a coal tar preparation ap- 

 plied as a binder to the road. It makes 



the road surface slightly plastic so that 

 it yields instead of pulverizing under the 

 thrust of automobile wheels. The mat- 

 erial that is put into a tarviated road 

 stays there. Automobiles create pract- 

 ically no dust, and water torrents and 

 frost do no damage. 



A road built with Tarvia binder costs 

 a little more than ordinary macadam 

 but it lasts so much longer that the re- 

 duction in maintenance charges pays for 

 the treatment. 



Tarvia is made in three grades :- 

 Tarvia X, for road construction. 

 Tarvia A, for use in . surfacing old 

 roads and keeping them dustless. 



Tarvia B, for dust suppression on old 

 roads. 



Booklet showing photographs of roads 

 all over the country which have been 

 treated with Tarvia, mailed on applica- 

 tion to nearest office. 





BARRETT MANUFACTURING CO. 



L _ 





FORSTRY STUDENTS PUBLISH MAGA- 

 ZINE. 



The students of the Forestry Department of 

 the University of Michigan have begun the 

 publication of a quarterly magazine devoted 

 to their interests. The name adopted is "The 

 Universitp of Michigan Forester," and the sec- 

 ond nun-.ber has made its appearance on the 

 campus. The editors are H. A. Green, E. I. 

 Kotok and G. M. Jennings. 



WELL KNOWN PLANT CHANGES 



HANDS. 



The roads of the future, and of the present 

 also for that matter, will be constructed with 

 a binder of asphalt oil or similar material. 

 This much is admitted by many engineers and 

 read building experts. The pressing need at 

 present is for machinery capable of handling 

 this material in the quickest, easiest and most 

 economical manner. Realizing this fact The 

 Good Roads Machinery Company of Knnett 

 Square. Pa., who are specialists in road build- 

 ing machinery, tools and supplies, and who 

 are constantly aiming to broaden their field of 

 usefulness by furnishing contractors and road 

 builders with the most up-to-date and approv- 

 ed appliances for road and street building, 

 have taken over the road oiling machinery and 

 devices heretofore manufactured by the G. 

 !" \V. Co., Saratoga Springs, N. Y. This ma- 

 chinery will hereafter be manufactured at 



Groton, N. Y., and will be marketed by The 

 Good Roads Machinery Company through its 

 various branch offices and selling agencies. 



The Perfection Oil and Asphalt Distributor 

 has been manufactured and sold for the past 

 two years by the G. F. W. Co., of Saratoga 

 Springs, X. Y., and has received the unquali- 

 fied endorsement of road building contractors 

 as well as of Highway Engineers in New York 

 and other states. With this machine it is 

 possible to heat heavy oil and spread it upon 

 the road in a smooth, unbroken sheet of any 

 volume required. This appliance also handles 

 lighter oils that does not require heating. ThaJ 

 the machine is a labor and money saver is 

 evidenced by the fact that it can be operated 

 by one team of horses and one man. The 

 fuel cost per day does not exceed one dollar. 



The Good Roads Machinery Company, Fort 

 Wayne, Ind., gladly furnish all information 

 regarding their products. 



