A 4-4-6-4, in the Whyte notation for the classification of steam locomotives by wheel arrangement, is one that has four leading wheels followed by four coupled driving wheels, a second set of six coupled driving wheels and four trailing wheels.
The Pennsylvania Railroad's Q2 class were the only locomotives ever to use this arrangement. These were duplex locomotives, in which both sets of driving wheels were mounted in a common, rigid locomotive frame. This locomotive design was a further development of the highly successful 2-10-4. The divided drive, or duplex arrangement, allowed for higher speeds with less damage to the track.
Some models such as the iPhone 4 and iPhone 4s share the same-sized screen, so the screens can be used interchangeably. The iPhone 4, iPhone 4s, and any other Apple device with a screen that is 3.5 inches can be used this way. Compare specs and prices of the selected phones Screen size 4 to 4.4 inch side by side. To get the comparison select two and more phones and click 'Compare' button. Screen formats are determined by the specific aspect ratio of the screen. Aspect ratio is the fractional relation of the width of a video image compared to its height. The two most common aspect ratios in home video are 4:3 (also known as 4x3, 1.33:1, or standard) and 16:9 (16x9, 1.78:1, or wide-screen).
Screens 4 Pc
Other equivalent classifications are:
UIC classification: 2BC2 (also known as German classification and Italian classification)
French classification: 2232
Turkish classification: 2435
Swiss classification: 2/4+3/5 up to the early 1920s, later 5/9
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In advertising and marketing communication, fourth screen, or sometimes third screen, refers to a small portable video screen such as a mobile phone or portable media player.
Today, people use mobile devices in ways that open new possibilities for documentary practice.
History[edit]
The term fourth screen originates in reference to the actual historical sequence in the development of video screens. With the rapid proliferation of video networks in non-traditional spots such as movie theaters, bars and restaurants, gas stations, health clubs, and other place-based venues a category entitled 'fourth screen' was created. The first three screens are considered: TV, Internet, and Mobile. The fourth screen is mainly used in the advertising and media space with the explanation and use of digital signage. With the proliferation of technology, digital signage has expanded in this 'fourth screen' section to include movie theaters, gas stations and health clubs. One of the leading digital signage companies in movie theaters is Screenvision, with over 14,400 screens in the US.[1] Other leaders in the 'fourth screen' marketplace are Gas Station TV and Zephyr Media Inc; GSTV generates over 32 million digital signage impressions every month and Zephyr Media Inc on their US Army Network over 25 million digital signage impressions a month. In a recent Nielsen 'Fourth Screen' Market report, Nielsen identifies that the digital screens in the 'fourth screen' category generated over 237 million monthly exposures to persons 18+years or older. They go on to outline the various companies that are leaders in the space that include screenvision, NCM, Capitvate, GSTV and IndoorDirect.[2] Nielsen's 'Fourth Screen Network Audience Report' enables direct comparisons between digital place-based video networks and other video networks, including TV and Internet.
Screens 4 4 6 4 Operating Issues List
The video screens again are:
Screens 4 4 6 4 Hudson Locomotive
- television (TV)
- personal computer (PC), or Internet
- mobile telephone screens
- out of home digital signage.
References[edit]
- ^Nielsen Report, Digital Media, 2010
- ^'Archived copy'(PDF). Archived from the original(PDF) on 2011-12-07. Retrieved 2011-12-19.CS1 maint: archived copy as title (link)
