The French scale or French gauge system is commonly used to measure the size of a catheter. It is most often abbreviated as Fr, but can often be seen abbreviated as Fg, Ga, FR or F. It may also be abbreviated as CH or Ch (for Charriere, charriÃ¨re its). inventor round catheter of 1 French has an external diameter of 1â3 mm, and therefore the diameter of a round catheter in millimetres can be determined by dividing the French size by 3: D (mm) = Fr / 3. or. Fr = D (mm) * 3. For example, if the French size is 9, the diameter is 3 mm.
This article is about the stringed musical instrument. For other uses, see Cello (disambiguation). The cello (/ËtÊÉloÊ/ CHEL-oh; plural cellos or celli) or violoncello (/ËvaÉªÉlÉnËtÊÉloÊ/ VY-É-lÉn-CHEL-oh; Italian pronunciation: [vjolonËtÊÉllo]) is a bowed string instrument with four strings tuned in perfect fifths. The strings from low to high are generally tuned to C2, G2, D3 and A3, an octave lower than the viola.
A cello is a large stringed instrument, related to the viola, violin, double bass, and bass violin. The name cello is a shortening of violoncello, and is sometimes written with an apostrophe as âcello. The cello is usually played with a bow, as the violin, although it may also be plucked. The earliest origins of the cello date back to the mid-16th century, when a three-stringed bass violin was created. For the next hundred years a number of pieces were composed for this instrument, which was usually meant to be played in concert with a violin. In the mid-17th century, with the advent of metal-wrapped strings, an instrument much more like the modern cello was created.