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For example, a quarto (from Latin quartÅ, ablative form of quartus, fourth [3]) historically was a book printed on sheets of paper folded in half twice, with the first fold at right angles to the second, to produce 4 leaves (or 8 pages), each leaf one fourth the size of the original sheet printed – note that a leaf refers to the single piece ...
The precise origins of the dimensions of US letter-size paper (8.5 × 11 in) are not known. The American Forest & Paper Association says that the standard US dimensions have their origin in the days of manual papermaking, the 11-inch length of the standard paper being about a quarter of "the average maximum stretch of an experienced vatman's arms". [2]
In manufacturing and design, a mockup, or mock-up, is a scale or full-size model of a design or device, used for teaching, demonstration, design evaluation, promotion, and other purposes. A mockup may be a prototype if it provides at least part of the functionality of a system and enables testing of a design.
Models are built to scale, defined as the ratio of any linear dimension of the model to the equivalent dimension on the full-size subject (called the "prototype"), expressed either as a ratio with a colon (ex. 1:8 scale), or as a fraction with a slash (1/8 scale). This designates that 1 inch (or centimeter) on the model represents 8 such units ...
X-24 The X-24B in flight General information Type Lifting body National origin United States Manufacturer Martin Marietta Primary users United States Air Force NASA Number built 1 (X-24A, rebuilt as X-24B) History First flight 17 April 1969 (X-24A) 1 August 1973 (X-24B) Retired 26 November 1975 Developed from X-23 PRIME The Martin Marietta X-24 is an American experimental aircraft developed ...
Boeing mock-up of X-20 Dyna-Soar. Days after the launch of Sputnik 1 on 4 October 1957, on either October 10 [18] or October 24, [19] the USAF Air Research and Development Command (ARDC) consolidated Hywards, Brass Bell, and Robo studies into the Dyna-Soar project, or Weapons System 464L, with a three-step abbreviated development plan.
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