Excavation: Machinery Methods and Costs; Including a Revision of "Excavating Machinery" (Classic Reprint) - Tapa blanda

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Excerpt from Excavation: Machinery Methods and Costs; Including a Revision of "Excavating Machinery"

A noteworthy development in the field of excavating machinery has taken place since the publication of the book, "Excavating Machinery" in 1913. The author has received so many requests for information concerning the more recent types of excavators and the newer uses of older types, that it has seemed desirable to present this work.

The new book embodies some of the material of the former work, but is entirely re-cast and largely re-written. The new text has two general divisions; the first comprising a description of the construction, method and typical cost of operation of each type of excavator, and the second embodying a comparative study of the efficient and economic use of the different types of machines in the various fields of construction work. The author has endeavored to describe the make and types of excavators commonly used in all classes of work. He has not attempted to describe or even mention every make of excavator, but every type has been treated in sufficient detail to give a clear idea of its construction and field of work.

The cost data are not intended to be an arbitrary guide for the use of any type of excavator in any stated class of work. The conditions and circumstances attending work of this character are so variable, and there are usually so many unforeseen factors which affect the progress of a job, that information of this kind can only be suggestive. The illustrative "costs of operation" given in the first division, are merely typical outlines. The quantities should be modified to suit local conditions and combined with ruling prices to secure usable cost data for any definite case. In the second division the cost data have been selected to offer a variety of conditions on recent examples of earthwork. No attempt has been made to standardize these data or to formulate the results for any series of operations for any type of machine. The author has derived many equations from his experience, but hesitates to publish them on account of their possible misuse.

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