. Railroad construction : theory and practice : a textbook for the use of students in colleges and technical schools . ^The first rod reading will be , giving the 155-foot Fig. 5. Plot the results in a note-book which is ruled in quarter-inch squares, using a scale of 100 feet per inch in both directions. Plot the work up the page; then when looking ahead along the line, the work is properly oriented. When a contour crosses

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