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A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.
Some clinics do not have 6-metre eye lanes available, and either a half-size chart subtending the same angles at 3 metres (9.8 ft), or a reversed chart projected and viewed by a mirror is used to achieve the correct sized letters. In the most familiar acuity test, a Snellen chart is placed at a standard distance: 6 metres.
Inches are used for display screens (e.g. televisions and computer monitors) worldwide. It is the official Japanese standard for electronic parts, especially display screens, and is the industry standard throughout continental Europe for display screens ( Germany being one of few countries to supplement it with centimetres in most stores [ 12 ] ).
Actual size is approximately 1 ⁄ 4 by 1 ⁄ 4 inch (6 by 6 mm). Individual coloured droplets of ink are visible; this sample is about 150 DPI. Dots per inch (DPI, or dpi [1]) is a measure of spatial printing, video or image scanner dot density, in particular the number of individual dots that can be placed in a line within the span of 1 inch ...
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foot (French measure or Paris foot) 12.789 inches: ≈ 32.48 cm arpent, as a measure of length: 180 feet (French measure) ≈ 58.47 m arpent, as a measure of area: 32 400 square feet (French measure) ≈ 3,418.89 m 2: perch, as a measure of length: 18 feet (French measure) ≈ 5.85 m perch, as a measure of area: 324 square feet (French measure ...
The layout of the table is ugly for a start. Also why do we want such a page anyway? Just multiply/divide by 2.54. -- SGBailey 22:46 Dec 23, 2002 (UTC) The point of teh table is for quick refrence, also some other encylopeadias have it so why not wikipedia? -fonzy A link to an online converter would be better. --mav
Under the 1300 Composition of Yards and Perches, one of the statutes of uncertain date that was notionally in force until the 1824 Weights and Measures Act, "3 barly cornes dry and rounde" [2] [3] were to serve as the basis for the inch and thence the larger units of feet, yards, perches and thus of the acre, an important unit of area.