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Railroad Field Manual for Civil Engineers by William Raymond 1915 First Edition,
Railroad Field Manual for Civil Engineers by William Raymond 1915 First Edition, First Thousand 386 pages Indexed
PREFACE
This book is for field use rather than for office use, though it is adapted to a large percentage of office work. It is made on a new plan which is not expected to gain immediate favor but which it is hoped will eventually appeal to railroad engineers as sensible and worthy of adoption, because its use will save time and lessen the liability of error. The degree is divided decimally instead of sexagesimally. When the author was a young man engaged on railroad location he if knew one or two engineers who had one vernier of their transits graduated to read hundredths of degrees for greater convenience in setting out curves. They would have done all their work in decimals if tables had been available.
When the author was planning this book he gave much thought to the question of the division of the degree and the forms of the tables that would be most convenient and time saving for the field men who might use the book. He remembered that in practically every curve problem it is necessary at some stage of the solution to transpose from minutes and seconds to decimals of a degree or vice versa. He remembered that to lay out subchords would require much less mental effort if the transit were divided to read decimals of degrees rather than minutes. Ile wrote to a half dozen of the leading instrument makers to learn what would be the cost of changing the verniers on an old transit to read decimals of a degree and to know whether there would be any difference in price between two instruments ordered new, one to be divided in the usual way and the other divided to read decimals of a degree. All but one of the makers gave a price in the neighborhood of $20 for changing the verniers on an old instrument, and no difference in cost for new instruments. The author then wrote to about fifty engineers, chief engineers of railroads, independent practicing engineers, and professors of railroad engineering in colleges and asked their opinions as to the desirability of a change in practice from sexagesimal to decimal division of the degree, and whether or not a table book based on the decimal division would help to bring about the change, if desirable. All but one of these engineers replied that the change is desirable. The one was a professor of railroad engineering.
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