Titolo: Field-Book for Railroad Engineers: Containing Formulae for Laying Out Curves, Determining Frog Angles, Levelling, Calculating Earth-Work, Etc., Etc.; Together With Tables of Radii, Ordinates, Deflections, Long Chords, Magnetic Variation, Logarithms, Logar
Editore: Forgotten Books
Data di pubblicazione: 2018
Lingua: Inglese
ISBN 10: 0282798005
ISBN 13: 9780282798000
Rilegatura: PAP
Condizione: New
Peso: 393 grammi

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Excerpt from Field-Book for Railroad Engineers: Containing Formulae for Laying Out Curves, Determining Frog Angles, Levelling, Calculating Earth-Work, Etc., Etc.; Together With Tables of Radii, Ordinates, Deflections, Long Chords, Magnetic Variation, Logarithms, Logarithmic and Natural Sines, Tangents

Ble. Those specially prepared for this work have been computed with great care. The values have in some cases been carried out farther than ordinary practice requires, in order that interpolated values may be obtained from them more accurately. For the greater part of the material composing the Table of Magnetic Variation the author is indebted to Professor Bache, whose distinguished ability ir conducting the operations of the Coast Survey is equalled only by his desire to diffuse its results. The remaining tables have been carefully examined by comparing them with others of approved reputation for accuracy. Many errors have in this way been detected in some of the tables of corresponding extent in general use, particularly in the Table of Squares, Cubes, &c., and the Tables of Logarith mic and Natural Sines, Cosines, dzc. The number of tables might have been greatly increased, but for an unwillingness to insert any thing not falling strictly within the plan of the work or not resting on sufiicient authority.

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