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  2. Lift slab construction - Wikipedia

    en.wikipedia.org/wiki/Lift_slab_construction

    Lift slab construction (also called the Youtz-Slick Method) is a method of constructing concrete buildings by casting the floor or roof slab on top of the previous slab and then raising (jacking) the slab up with hydraulic jacks. This method of construction allows for a large portion of the work to be completed at ground level, negating the ...

  3. U.S. Army Corps of Engineers Bay Model - Wikipedia

    en.wikipedia.org/wiki/U.S._Army_Corps_of...

    The U.S. Army Corps of Engineers Bay Model is a working hydraulic scale model of the San Francisco Bay and Sacramento-San Joaquin River Delta System. While the Bay Model is still operational, it is no longer used for scientific research but is instead open to the public alongside educational exhibits about Bay hydrology.

  4. Eastern span replacement of the San Francisco–Oakland Bay ...

    en.wikipedia.org/wiki/Eastern_span_replacement_of...

    Both western catwalks were installed and by mid-August, all four catwalks were installed in place and an approximation of the completed outline of the bridge could then be seen. All four catwalks, the traveler, its suspension cable and the drafting cables and the winches and specialized tracks at the deviation saddles had to be in place before ...

  5. Alpha Hydraulic Diggings - Wikipedia

    en.wikipedia.org/wiki/Alpha_Hydraulic_Diggings

    The tremendous hydraulic diggings, visible from near this point, engulfed most of the original townsites. Alpha was the birthplace of famed opera singer Emma Nevada. Mining at Omega continued until 1949, and lumbering operations are carried on there today (1958). California Registered Historical Landmarks Nos. 628-629 [2]

  6. Tacoma Narrows Bridge (1950) - Wikipedia

    en.wikipedia.org/wiki/Tacoma_Narrows_Bridge_(1950)

    The midspan and tower hydraulic damping mechanisms were also installed, and workers began removing the catwalks, tower buttresses, and other working platforms. Work also progressed at the west end of the bridge, where workers modified the 450-foot-long (140 m) approach viaduct that once had been a part of the 1940 span for use in the 1950 bridge.

  7. Central Valley Project - Wikipedia

    en.wikipedia.org/wiki/Central_Valley_Project

    1850s - Hydraulic mining in gold region contaminates Sacramento Delta with silt and mercury [10] 1850 - California Indian Protection Act removes Indian's civil rights and enslaves them, starting the mass genocide of many of the state's 300 tribes; 1850 - California adopts British Common Law causing 70 years of disputes over water rights

  8. California Aqueduct - Wikipedia

    en.wikipedia.org/wiki/California_Aqueduct

    When it was open, the California Aqueduct Bikeway was the longest of the paved paths in the Los Angeles area, at 107 miles (172 km) long from Quail Lake near Gorman in the Sierra Pelona Mountains through the desert to Silverwood Lake in the San Bernardino Mountains. This path was closed in 1988 due to bicyclist safety and liability issues.

  9. Moving walkway - Wikipedia

    en.wikipedia.org/wiki/Moving_walkway

    Moving walkway inside the Changi Airport station of the Singapore MRT. A moving walkway, also known as an autowalk, [1] moving pavement, [2] moving sidewalk, [3], travolator, [4] or travelator (British English), [5] is a slow-moving conveyor mechanism that transports people across a horizontal or inclined plane over a short to medium distance. [6]