Westinghouse Sign
The Westinghouse Sign was a large, animated, electric sign advertising the Westinghouse Electric company and located in Pittsburgh, Pennsylvania, U.S.A. The sign was best known for the huge number of combinations in which its individual elements could be illuminated. The sign was removed in 1998 when the building on which it was mounted was demolished to make way for the construction of PNC Park.
The various corporations which have carried the Westinghouse name have erected countless signs and other promotional devices during the past 140 years, including many in the corporate hometown of Pittsburgh. A cubic Westinghouse sign stood in downtown Pittsburgh for approximately thirty five years and was so familiar that it was allowed to remain in place until 2002, even after the building it marked the Westinghouse Tower was no longer owned or occupied by Westinghouse.
Palo Verde Nuclear Generating Station
The Palo Verde Nuclear Generating Station, commonly referred to as Palo Verde Power Plant, is a nuclear power plant located in Tonopah, Arizona, about 50 miles (80 km) west of central Phoenix, and is currently the largest nuclear generation facility in the United States, averaging over 3.2 gigawatts (GW) of electrical power production in 2003 to serve approximately 4 million people. Arizona Public Service (APS) owns the largest portion (29.1%) of the station and operates the facility. Other owners include Salt River Project (17.5%), El Paso Electric Co. (15.8%), Southern California Edison (15.8%), PNM Resources (10.2%), Southern California Public Power Authority (5.9%), and the Los Angeles Dept. of Water & Power (5.7%).
Palo Verde is the only nuclear generating facility in the world that is not located adjacent to a large body of above-ground water. Instead, it evaporates water from the treated sewage of several nearby municipalities to meet its cooling needs. The water consumed by the Palo Verde Nuclear Generating Station represents about 25% of the annual overdraft of the Arizona Department of Water Resources Phoenix Active Management Area.
via Palo Verde Nuclear Generating Station – Wikipedia, the free encyclopedia.
Grand Coulee Dam
The Grand Coulee Dam is a hydroelectric gravity dam on the Columbia River in the U.S. state of Washington. In the United States, it is the largest electric power-producing facility and the largest concrete structure. It is the seventh largest producer of hydroelectricity in the world, as of the year 2008.
The reservoir is called Franklin Delano Roosevelt Lake, named after the United States President who presided over the completion of the dam. The foundation was built by the MWAK Company, a joint effort of several contractors united for this purpose. Consolidated Builders Incorporated, including industrialist Henry J. Kaiser, completed the dam. The United States Bureau of Reclamation supervised the contractors and operates the dam. Folk singer Woody Guthrie was commissioned by the Bonneville Power Administration to write songs about the Columbia Basin Project; the songs Roll On Columbia and Grand Coulee Dam are part of that series.
The Grand Coulee Dam is almost a mile long at 5223 feet (1586 m). The spillway is 1,650 feet (503 m) wide. At 550 feet (168 m), it is taller than the Great Pyramid of Giza; all the pyramids at Giza could fit within its base. Its hydraulic height of 380 feet (115 m) is more than twice that of Niagara Falls. There is enough concrete to build a four-foot wide, four-inch deep sidewalk twice around the equator.
via Grand Coulee Dam – Wikipedia, the free encyclopedia.
Fish Ladder
A fish ladder, also known as a fishway, fish pass or fish steps, is a structure on or around artificial barriers such as dams and locks to facilitate diadromous fishes' natural migration. Most fishways enable fish to pass around the barriers by swimming and leaping up a series of relatively low steps hence the term ladder into the waters on the other side. The velocity of water falling over the steps has to be great enough to attract the fish to the ladder, but it cannot be so great that it washes fish back downstream or exhausts them to the point of inability to continue their journey upriver.
via Fish ladder – Wikipedia, the free encyclopedia.
Peshtigo Fire
The October 8, 1871 Peshtigo Fire in Peshtigo, Wisconsin, is the conflagration that caused the most deaths by fire in United States history. Having occurred on the same day as the more infamous Great Chicago Fire, the Peshtigo Fire is mostly forgotten. On the same day as the Peshtigo and Chicago fires, the cities of Holland, and Manistee, Michigan, across Lake Michigan, also burned, and the same fate befell Port Huron at the southern end of Lake Huron.
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Two Generals’ Problem
In computing, the Two Generals’ Problem is a thought experiment meant to illustrate the pitfalls and design challenges of attempting to coordinate an action by communicating over an unreliable link. It is related to the more general Byzantine Generals’ Problem (though published long before that later generalization) and appears often in introductory classes about computer networking (particularly with regards to the Transmission Control Protocol), though it can also apply to other types of communication. Some authors also refer to this as the Two Army Problem or the Coordinated Attack Problem.
via Two Generals’ Problem – Wikipedia, the free encyclopedia.
Extispicy
Extispicy (from Latin extispicium) is the practice of using anomalies in animal entrails to predict or divine future events. Organs inspected can include the liver, intestines, lungs, or other major organs. The animal used for extispicy must often be ritually pure and slaughtered in a special ceremony.
The practice was first common in ancient Mesopotamian, Hittite and Canaanite temples. Later, soothsayers from Ancient Roman times used the entrails of a bull to determine the advisability of a particular endeavor and Etruscans used patterns seen in the livers of sheep to assess their future. There exists substantial evidence to indicate that this was the main form of divination within classical cultures.
Organ models and extispicy manuals in cuneiform script are widely found in archaeological excavations in the regions, showing the prevalence and significance of extispicy. Commonly, (in antiquity) the majority of the divination was wrought from viewing the intestines and the liver.
Although extispicy would commonly be viewed with skepticism by the modern mind, some 20th century scholars suggested that this technique was also a valuable and legitimate form of, essentially, autopsy, which might indicate internal disease tied to poor environmental factors, information that would be important to nomadic peoples.
Buy anything from McMaster-Carr
I just discovered the magical website of McMaster-Carr. They will sell you nearly anything. Prices are rather high, but everything looks to be really high quality, to the level of commercial / industrial demands. Best part: They have no minimum size order! Perfect for the hobbyist or experimenter. Here’s the huge list of things they sell, check out their very excellent website for pictures and more.
- Abrading & Polishing
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Jane’s Information Group
Jane’s Information Group is a publishing company specializing in transportation and military topics, which was founded by Fred T. Jane in 1898. Jane began by sketching ships as an enthusiast, and this gradually developed into an encyclopedic knowledge, culminating in the publishing of “All the World’s Fighting Ships”. The company Jane founded gradually branched out into other arenas of military expertise. The books and trade magazines published by Jane’s are often considered the de-facto public source of information on warfare and transportation systems. Major competitors include Defense News, Flight International and Aviation Week. Jane’s continues to provide open source intelligence in the defense, security, transport and law enforcement sectors.
via Jane’s Information Group – Wikipedia, the free encyclopedia.
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Proportional navigation
Proportional navigation is a guidance law used in some form or another by most homing air target missiles. It is based on the fact that two vehicles are on a collision course when their direct Line-of-Sight does not change direction. PN dictates that the missile velocity vector should rotate at a rate proportional to the rotation rate of the line of sight and in the same direction.
An = N' * L' * V
Where An is the acceleration perpendicular to missile velocity vector, N’ is the proportionality constant (dimensionless), L’ is the line of sight rate, and V is the velocity.
For example, if the line of sight rotates slowly from north to east, the missile should turn to the right by a certain factor faster than the LOS-rate. This factor is called the Navigation Constant K_nav.
via Proportional navigation – Wikipedia, the free encyclopedia.