Show WOODEN FOR PAVEMENTS n Government Experiments Ex p in Paving Give Good Results TO FIND BEST MATERIAL Suitability of or m Be ne Det In lu I apolis has Ion long Iona been used Cor pavements Only tt within the past few years cars cr houe has it St been tot ily adopted In the cities titles of the United Stales Previous failures allures can be bc traced almost entirely to improper construction or m methods of preparation tion In most cases round lound blocks o of ce cedar ar oi or other woods were u used cd without with out n adequate c foundation for tOl the pave pave- ment The consequence was that a. a as a. asa a u paving JH material woo wood fell Into dis dis- ls- ls favor or Recent U use c o of rectangular ulal wooden woollen blocks for tor street streel i t pavement has hns en ch-en I excellent results Many Nany engineers belleve bc- bc that thc these e blocks when properly proper proper- ly Iv creosoted an and laid on a concrete C foundation make a n pavement pa which possesses high excellence in a greater number of essential qualities than any other now non In use Among these qualities qualities quill quill- ties are arc gt great l' l t smoothness low U traction actton resistance minimum noise and antI considerIng considering con cou- Its It smoothness comparatively little slipperiness Slipperiness has sometimes C proved but bul bulIs butIs butIs Is not nol greater for tt wood than titan for sheet asphalt all temperature conditions considered an andwood woo is much Wroth le less leis variable var val in Ih this particular than is the asphalt It is probable that no other pavement with equally slight U resistance will twill be found less lass slippery pavement ment Is s also cos easy to clean elcan an and to lu maintain and when t well ell lal laid gives glues promise of oC proving n more durable dw than au any other except one une constructed o of tile the hardest granite The cull cost of creosoted woo wood trued pavement pave e e- e ment Is at al pr pre com pal cly high averaging about aboUl 3 per pcr square quare yard Including concrete foundation In several sev sev- several eral cral cities however howe the cost of the pavement has been bem reduced materially material 1 ly Iy below this figure and good oo results have been secured In Minneapolis Minn where the eH city itself lays nys the pavement the thc total cost per yard is approximately 20 To attempt to toche che cheapen the price however hoc at al the expense of thoroughness of u treatment or C careful construction is with creo- creo sote soled wood nood woo pavement dangerous economy Even at the pre pre- prevailing ailing price the excellence o of this pa pavement causes mau many cn engineers to lo regard it as the best general purpose C one Que now in ht use Tho The l live five c cities In ht t which the largest amounts of oC wood pavement are arc found Cound arc in W order Jn Indianapolis New York Minneapolis Toledo o and II Bosto Boslo os i. i Together To To- Together gether lh sc c titles have hove mot mute mote e creosoted creo- creo sot soled than pavement pa all other oilier vines vales In the thC United States Slates com combined The total amount of this pavement pa in iu use usein in this country al it tho the cn end of tho year rear 1905 was leas about 1 square yards aI s. s to to nearly 8 So mlle miles i of p II O lve- on un a sh street 30 feet wide Two main mein causes have militated against a P. z wider folder adoption of the Iho creosoted ereo- ereo sote block pavement pa One Olle has lIas been heen the prejudice which n was as engendered by the Iho former Cornier experience with wood the he other Is the hc ll ilse rie e In price of longleaf long long- leaf eaf or ut Georgia pine lIne which is rho ho woo wood woodlow now non principally used The forest ser service vice ice is making e tI to find out what woo woods s are arc most suitable for use in iu paving pa and whether less ex expensive ex- ex pensive woods could not be used lo to supplement the Georgia pine The Tho in- in have JUve been upon three lines to lo lo learn lemn the thc present situation to tomake tomake tomake make tests u of the suitability v of various arlous woods and to tu lay experimental pavements pavements pavements pave pave- ments and nol note their wear un under er actual uc- uc conditions An All experimental pavement has now been laid told in the thc city cily u of Minneapolis as us a co operative undertaking between ecu th the city government o u and awl the forest service r Different woods tweeds were donate donated In lots lotI v of I 1 board feel b by n a number number number num num- ber u o of lumber companies or ur lumber as associations interested in extending the life nr market for fur their respective woo woods s Creosote all and were te ted b by ta two Iwo o manufacturers of wood pavement The Thc woods tweeds i u-c u used were leur pine lIllie Nurn Norway t pine tamarack white while birch ch western larch nod and fir HI All Al blocks ecru ui IJ laid with the fit grain nin vertical verti cal und and a were 1 i Inches In depth 1 i Inches u wide and from from runt 4 1 to tu 10 inches long lent Jhc These e blocks were impregnated with creosote and laid upon a tiun lion of Portland concrete Successive Suc Suc- c sections o of the thc pavement wore were laid lull in iu woods wood Also thc fife angles of the cow courses w n wore re varied one unc being al at right angles I t to tu the another another an an- other othel at 45 degrees tad and a third between be be- tween lwell the ln two u or 01 07 7 1 dc degrees n es This experiment pavement Ila wa was laid on un u a sU which carries tin the heaviest lt of the ell Illy xu xo t results can call be he obtained li lias In Inas inas as short u u time as ns Traffic ic records n will be e mado matlo t twice vice a month on alt different Ila slays days M u oC th the tho week and from rec records r t un an accurate know l e edge ede e o of conditions may bu Ill ob ob- ll This Investigation should h Information un on the thu following points points- l Iho 1 ho suitability v ot the various vallous woods the relative c e value alu of all and the bust best l dimensions fo for fOl forthe the Ule blocks and tho the mull most l set serviceable angle for tor the courses COUll J |