Download Conquering Gotham: Building Penn Station and Its Tunnels by Jill Jonnes PDF

By Jill Jonnes

"Superb. [A] pleasant narrative" (The Wall road Journal ) concerning the arguable development of latest York's cherished unique Penn Station and its tunnels.

As bestselling books like Ron Chernow's Titan and David McCullough's The nice Bridge verify, readers are fascinated by the grand personalities and schemes that populated ny on the shut of the 19th century. Conquering Gotham re- creates the riveting fight waged through the good Pennsylvania Railroad to construct Penn Station and the huge process of tunnels that might attach water-bound ny to the remainder of the continent through rail. Historian Jill Jonnes tells a beautiful story of snarling plutocrats, engineering feats, and backroom politicking filled with the main colourful figures of Gilded Age big apple.

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Extra resources for Conquering Gotham: Building Penn Station and Its Tunnels

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The Direct Shear Test In order to obtain shear strength parameters for use in rock slope design, some sort of testing is often required. This testing may take the form of a simple field test or of a very sophisticated laboratory or in situ test in which all the characteristics of the in situ rock discontinuity are reproduced as accurately as possible (Hoek and Bray 1977). 10) is a useful tool to determine the strength parameters of cohesion, c, and friction angle, φ, for a discontinuity. 11) to force shearing along a predetermined surface.

Minor, or second-order, asperities are designated as roughness. Asperities of roughness are considered to be sufficiently small that they are likely to be sheared off during movement along the joint plane (Piteau 1970). Increased roughness of the joint walls results in an increased friction angle along the joint. However, the effects of first- or second-order asperities have been found to be greatly reduced by gouge or other infilling materials. © 1999 by the Society for Mining, Metallurgy, and Exploration.

An example of using the latter technique is included as well. The Limiting Equilibrium Concept At limiting equilibrium, by definition, all points are on the verge of failure. At this point in time, the driving forces (or stresses, moments) just equal the resisting forces (or stresses, moments), and the factor of safety equals unity. Where the resisting forces of a slope are greater than the driving forces, the factor of safety is greater than unity and the slope is stable; when the resisting forces are less than the driving forces, the slope is unstable.

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