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The French scale, also known as the French gauge or Charrière system, is a widely used measurement system for the size of catheters. It is commonly abbreviated as Fr but may also be abbreviated as Fg , FR or F , and less frequently as CH or Ch (referencing its inventor, Charrière ).
Relationship between number of feet, octave and size of an open flue pipe (1′ = 1 foot = about 32 cm) Play ⓘ Scaling is the ratio of an organ pipe's diameter to its length. The scaling of a pipe is a major influence on its timbre. Reed pipes are scaled according to different formulas than for flue pipes.
Comparison of .577 Black Powder Express, .303 British & 8 bore bullets. The most common 8 bore cartridges used paper cases, much like shotgun shells, and true .835 in (21.2 mm) caliber projectiles. A larger version utilising a thin brass case was also available, although it fired .875 in (22.2 mm) projectiles, in reality making it a 7 bore. [5]
The siriometer is an obsolete astronomical measure equal to one million astronomical units, i.e., one million times the average distance between the Sun and Earth. [13] This distance is equal to about 15.8 light-years, 149.6 Pm, or 4.8 parsecs, and is about twice the distance from Earth to the star Sirius. [14]
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.
l = the length of the pipe; If v is assumed to be 343 m/s (the speed of sound at sea level, with temperature of 20 °C), and the pipe length l is assumed to be eight feet (2.44 m), then the formula yields the value of 70.4 hertz (Hz; cycles per second). This is not far from the pitch of the C two octaves below 440 Hz, which (when concert pitch ...
In many measurement systems based on former English units, the link has remained fixed at 0.66 feet, therefore 0.22 yards or 7.92 inches; it is the absolute length of the yard that has varied. A rare remaining application of the link is in the service of some surveying in the United States, which relates to the definition of the survey foot.
Dual gauge between Russian gauge and another similar gauge can make these bonus gauges. 1,829 mm (6 ft) 1,945 mm (6 ft 4 + 9 ⁄ 16 in) 2,134 mm (7 ft) 2,140 mm (7 ft 1 ⁄ 4 in) (Brunel gauge) 2,503 mm (8 ft 2 + 1 ⁄ 2 in) (the maximum bonus gauge from the 1,435 mm (4 ft 8 + 1 ⁄ 2 in) standard gauge gauntlet tracks).