The Sprain Brook was first proposed in the early 1920s as a parkway between the Bronx River Parkway and the Hawthorne Circle. The parkway sold a majority of its right-of-way in the 1920s, but the proposed parkway met strong opposition from the village of Bronxville and Yonkers. The Sprain Brook proposal sat on the table until 1949, when the State Council of Parks, run by Robert Moses, sought to ease congestion on the Bronx River Parkway. Moses proposed that a new state park would be constructed in Westchester, with the Sprain Brook Parkway serving as a traffic alternative to the Bronx River, and nearly a decade and a half after the parkway was deeded land. This time, Bronxville opposed the project rather than Yonkers, but an agreement was worked out in 1951. This new alignment would bypass the parts of Bronxville and Yonkers to construct the freeway. (Full article...)
The airline began operations in 2007 as an independent airline company using branding licensed from the United Kingdom–based Virgin Group, which also controls the brand of the Virgin Atlantic and Virgin Australia airlines. The Alaska Air Group acquired Virgin America in April 2016, at a cost of approximately $4 billion and continued to operate Virgin America under its own name and brand until the airline was fully merged into Alaska Airlines on April 24, 2018. (Full article...)
Originally proposed in the 1950s, I-440 was the subject of much controversy related to its location and design, which resulted in multiple design changes and delayed the highway's completion for many years. As a result, it was the last segment of Interstate Highway planned for Tennessee by the Federal Aid Highway Act of 1956 to be constructed. After its completion in 1987, I-440 developed unforeseen congestion, safety, and surface issues, which prompted a reconstruction of the entire route that was completed in 2020. (Full article...)
The railroad was chartered in 1832 in Connecticut, and in 1833 in Massachusetts; the two companies merged in 1836. Construction began in 1835. The line opened between Norwich and Plainfield in 1839, and the full length to Worcester in 1840. An extension to Allyn's Point was completed in 1843 to improve connecting steamboat operations. The line was leased by the Boston, Hartford and Erie Railroad in 1869, and became part of the New York, New Haven and Hartford Railroad (the New Haven) system in 1898. The following year, a second extension to Groton was completed. (Full article...)
The accident exposed major stewardship shortcomings of the privatised national railway infrastructure company Railtrack. Reports found there was a lack of communication and some staff were not aware of maintenance procedures. Railtrack subsequently went into administration and was replaced by Network Rail. The aftermath of the accident saw widespread speed limit reductions throughout the rail network and a tightening of health and safety procedures, the repercussions of which were still felt years later. In 2005, both Railtrack and the contractor Balfour Beatty were found guilty of breaching health and safety laws. (Full article...)
A micrometer is a device incorporating a calibrated screw, widely used for precise measurement of components in mechanical engineering and machining. Micrometers are usually, but not always, in the form of calipers (opposing ends joined by a frame). The spindle is a very accurately machined screw and the object to be measured is placed between the spindle and the anvil. The spindle is moved by turning the ratchet knob or thimble until the object to be measured is lightly touched by both the spindle and the anvil.
An escalator is a moving staircase for carrying people between floors of a building. The device consists of a motor-driven chain of individual, linked steps that move up or down on tracks, allowing the step treads to remain horizontal.
The Apple Bandai Pippin is a multimedia technology console designed by Apple Computer based on the Apple Pippin platform, and produced by Bandai. Only 100,000 of the consoles were produced between its 1996 release and 1997 discontinuation. The Bandai Pippin was intended to create an inexpensive computer aimed mostly at playing CD-based multimedia software, especially games, but also functioning as a thin client.
A thermoplastic-sheathed cable consists of a toughened outer thermoplastic sheath of polyvinyl chloride, covering one or more individual annealed copper conductors. Each of the current-carrying conductors in the "core" is insulated by an individual thermoplastic sheath, coloured to indicate the purpose of the conductor concerned. The protective earth conductor may also be covered with insulation, although, in some countries, this conductor may be left as bare copper. The type of thermoplastic, the dimensions of the conductors and the colour of their individual insulation are specified by the regulatory bodies in the various countries concerned.
An animated cut-away diagram of a typical fuel injector, which is used to spray controlled amounts of petrol (gasoline) into an internal combustion engine. A solenoid is activated when fuel is intended to be delivered to the engine, causing the plunger to become pulled toward the solenoid by magnetic force. This uncovers the valve opening, allowing fuel to flow into the atomiser and out the spray tip. The route of fuel is shown in orange; grey/blue indicates no fuel present.
Two TRS connectors (also known as jack plugs or phone plugs), a common audio connector. They are cylindrical in shape, with two or more contacts. Originally invented for use in telephone switchboards, jack plugs are still widely used, both in the original ¼-inch (6.3 mm) size and in miniaturized versions. The top plug in this image is for stereo connections, while the bottom is for mono.
The Wiesen Viaduct is a single-track railway viaduct (concrete blocks with dimension stone coverage) which spans the Landwasser southwest of the hamlet of Wiesen, Switzerland. Designed by Henning Friedrich, then the chief engineer of the Rhaetian Railway, it was built between 1906 and 1909 by the contractor G. Marasi (Westermann & Cie, Zürich) under the supervision of P. Salaz and Hans Studer (RhB). The Rhaetian Railway still owns and uses the viaduct today for regular service with 29 passenger trains per day. An important element of the Davos–Filisur railway, the viaduct is 88.9 metres (292 ft) high, 210 metres (690 ft) long, and has a main span of 55 metres (180 ft). In 1926, the viaduct was the inspiration for Ernst Ludwig Kirchner's painting Brücke bei Wiesen.
Image 11A rare 1884 photo showing the experimental recording of voice patterns by a photographic process at the Alexander Graham Bell Laboratory in Washington, D.C. Many of their experimental designs panned out in failure. (from Invention)
Image 16The wheel, invented sometime before the 4th millennium BC, is one of the most ubiquitous and important technologies. This detail of the "Standard of Ur", c. 2500 BCE., displays a Sumerian chariot. (from History of technology)
ChatGPT (Chat Generative Pre-trained Transformer) is a chatbot developed by OpenAI and launched on November 30, 2022. Based on a large language model, it enables users to refine and steer a conversation towards a desired length, format, style, level of detail, and language. Successive prompts and replies, known as prompt engineering, are considered at each conversation stage as a context. (Full article...)
X, formerly and commonly called Twitter, is an online social media and social networking service operated by the American company X Corp., the successor of Twitter, Inc. On X, registered users can post text, images and videos. Users can also like, repost, quote repost, comment on posts, direct message, video and audio call, bookmark, join lists and communities, and join public Spaces with other registered users. Users can vote on context added by approved users using the Community Notes feature. Posting information to the site is often referred to historically as tweeting, retweeting and quote tweeting/retweeting (depending on the country). Although the service is now called X, the primary website address remains twitter.com , with the x.com domain name redirecting to that address. (Full article...)