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The largest letter on an eye chart often represents an acuity of 6/60 (20/200), the value that is considered "legally blind" in the US. Many individuals with high myopia cannot read the large E without glasses, but can read the 6/6 (20/20) line or 6/4.5 (20/15) line with glasses. By contrast, legally blind individuals have a visual acuity of 6/ ...
For 6/6 = 1.0 acuity, the size of a letter on the Snellen chart or Landolt C chart is a visual angle of 5 arc minutes (1 arc min = 1/60 of a degree), which is a 43 point font at 20 feet. [10] By the design of a typical optotype (like a Snellen E or a Landolt C), the critical gap that needs to be resolved is 1/5 this value, i.e., 1 arc min.
Cellos exist in a smaller range of sizes than violins, with 4/4, 3/4, 1/2, 1/4, 1/8, and 1/10 being reasonably common. As with the violin, the Stradivarius scale is regarded as standard for orchestral work; This is about 27.4 inches (700 mm). Violas are commonly described in terms of their body length rather than by a fraction. There are two ...
For example, if the French size is 9, the diameter is 9/3 = 3.0; mm. It is seen that the French unit is fully redundant with the metric system but introduces potential for rounding errors. This metrication [broken anchor] problem is further complicated by the mixed use of metric and imperial units in medical professions using catheters.
Brannock Device. The Brannock Device is a measuring instrument invented by Charles F. Brannock for measuring a person's shoe size. Brannock spent two years developing a simple means of measuring the length, width, and arch length of the human foot. He eventually improved on the wooden RITZ Stick, the industry standard of the day, [ 2] patenting ...
3.810 mm HOj scale. Very close to wargaming 20 mm figure scale (20 mm is actually 1:80.5). [10] 1:76.2: 4 mm: Model railways (00) UK model rail scale 4 mm scale (OO Scale, etc.). 1:76: 4.011 mm: Model railways (00) Military models. Military vehicles. Used with 4 mm to 1 foot models as well. 1:75: 4.064 mm Used by Heller for model ships. Also ...
Fermière; cut lengthwise and then sliced to desired thickness 1 ⁄ 8 – 1 ⁄ 2 inch (3–10 mm) Rondelle; cylindrical vegetables cut to discs of desired thickness 1 ⁄ 8 – 1 ⁄ 2 inch (3–10 mm) Tourné; 2 inches (50 mm) long with seven faces usually with a bulge in the center portion; Mirepoix; 3 ⁄ 16 – 1 ⁄ 4 inch (5–7 mm)
Metric drill bit sizes. Metric drill set, 1.0–6.0 mm by 0.1 mm, jobber length. The case that holds them in an indexed order (by size), via a graduated series of holes, is called a drill index. Metric drill bit sizes define the diameter of the bit in terms of standard metric lengths. Standards organizations define sets of sizes that are ...
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