. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools, and a hand-book for the use of engineers in field and office . ng the 155-foot the results in a note-book which is ruled in quarter-inchsquares, Using a scale of 100 feet per inch in both the work up the page; then when looking ahead along theline, the work is properly oriented. When a contour crossesthe survey line, the place of crossing may be similarly deter-mined. If the ground flattens out so that five-foot contours arevery far apart, the absolu
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools, and a hand-book for the use of engineers in field and office . ng the 155-foot the results in a note-book which is ruled in quarter-inchsquares, Using a scale of 100 feet per inch in both the work up the page; then when looking ahead along theline, the work is properly oriented. When a contour crossesthe survey line, the place of crossing may be similarly deter-mined. If the ground flattens out so that five-foot contours arevery far apart, the absolute elevations of points at even fifty-foot distances from the center should be determined. The * The method of making such observations is given in the Appendix. §13. RAILROAD SURVEYS. 17 method is exceedingly rapid. Whatever error or inaccuracyoccurs is confined in its effect to the one station where itoccurs. The work being thus plotted in the field, unusuallyirregular topography may be plotted with greater certainty andno great error can occur without detection. It would even bepossible by this method to detect a gross error that might havebeen made bv the level party,. Fig. 5.
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Keywords: ., bookauthorwebbwalt, bookcentury1900, bookdecade1920, bookyear1922
