. The trackman's helper, a handbook for track foremen, supervisors and engineers . r projecting through the fork of thepost. The poles should be about twenty feet long, andthe upper end should be about eight feet above theground. After setting the first pole in position, drivecross stakes about four feet from the upright post sothat they will lap over the inclined pole; then lay an-other pole in the crotch thus formed by the stakesand repeat the process until the fence is finished. Thecross stakes may be made from the tops of the branchesof the poles cut. This makes a good snow fence, butrequi
. The trackman's helper, a handbook for track foremen, supervisors and engineers . r projecting through the fork of thepost. The poles should be about twenty feet long, andthe upper end should be about eight feet above theground. After setting the first pole in position, drivecross stakes about four feet from the upright post sothat they will lap over the inclined pole; then lay an-other pole in the crotch thus formed by the stakesand repeat the process until the fence is finished. Thecross stakes may be made from the tops of the branchesof the poles cut. This makes a good snow fence, butrequires a good deal of work. The portable snow fence similar to that shown inFig. 49 is about the best form of snow fence in usetoday where the snow conditions are not too severe. The rotary plow and Sanger. The modern rotarysnow plow and flanger have made obsolete the old SPECIAL CONDITIONS ON MOUNTAIN ROADS 245 snow plow and snow bucking outfit, which were al-ways costly and hardly ever effective in keeping themountain passes open for anything like regular serv- rx6!xl6-o ix5Bolt. o ^Diagonal<6xao(2 per Sect) I x6x 16 i6fT Sections Fig. 49. Portable Snow Fence ice. If the rotary plow and Sanger are kept movingover the line during a storm the section men will havelittle snow shoveling to do except at switches, station 246 THE TRACKMANS HELPER platforms and snow slides. Turntables on the passesare usually housed in and require no attention. Water supply. There is sometimes trouble aboutkeeping up the flow of water to the tanks. Those lo-cated in the mountains are generally supplied bygravity; that is, there is an underground pipe line upsome stream to a point where the intake or upper endof the pipe is higher than the tank. The line isusually laid so deep that there is little danger of freez-ing, but as an additional precaution the lower end isprovided with a waste pipe arranged so that when thetank is full a valve in the lower end of the pipe line isopened and the water flows o
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