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  2. Snellen chart - Wikipedia

    en.wikipedia.org/wiki/Snellen_chart

    In the most familiar acuity test, a Snellen chart is placed at a standard distance: 6 metres. At this distance, the symbols on the line representing "normal" acuity subtend an angle of five minutes of arc, and the thickness of the lines and of the spaces between the lines subtends one minute of arc. This line, designated 6/6 (or 20/20), is the ...

  3. List of scale model sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_scale_model_sizes

    The rather uncommon [citation needed] 40 mm figure scale wargames figures fit approximately into this scale. 1:45: 6.773 mm This is the scale which MOROP has defined for O scale, because it is half the size of the 1:22.5 Scale G-gauge model railways made by German manufacturers. [citation needed] 1:43.5: 7.02 mm: Model railways (0)

  4. Brannock Device - Wikipedia

    en.wikipedia.org/wiki/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 his first ...

  5. 1:72 scale - Wikipedia

    en.wikipedia.org/wiki/1:72_scale

    1:72 scale. 1:72 scale is a scale used for scale models, most commonly model aircraft, where one inch on the model equals six feet (which is seventy-two inches) in real life. The scale is popular for aircraft because sizes ranging from small fighters to large bombers are all reasonably manageable and displayable.

  6. Visual acuity - Wikipedia

    en.wikipedia.org/wiki/Visual_acuity

    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.

  7. Scale ruler - Wikipedia

    en.wikipedia.org/wiki/Scale_ruler

    Scale ruler. A scale ruler is a tool for measuring lengths and transferring measurements at a fixed ratio of length; two common examples are an architect's scale and engineer's scale. In scientific and engineering terminology, a device to measure linear distance and create proportional linear measurements is called a scale.

  8. 1:32 scale - Wikipedia

    en.wikipedia.org/wiki/1:32_scale

    1:32 scale is a traditional scale for models and miniatures, in which one unit (such as an inch or a centimeter) on the model represents 32 units on the actual object. It is also known as "three-eighths scale", since 3⁄8 inch represents a foot. A 6 ft (183 cm) tall person is modeled as 21⁄4 in (57 mm) tall in 1:32 scale.

  9. 5 ft 6 in gauge railway - Wikipedia

    en.wikipedia.org/wiki/5_ft_6_in_gauge_railway

    United States. The Bay Area Rapid Transit system is the only operating railroad in the United States to use 1,676 mm (5 ft 6 in) broad gauge, with 120 miles (190 km) of double tracked routes. The original engineers chose the wide gauge for its "great stability and smoother riding qualities" [4] and intended to make a state-of-the-art system for ...

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