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 The french = size 3 times the diameter in. millimeters 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.
The violin has the highest pitch range of all the string instruments. 5 people found this useful.
What is the ideal string height? This depends on the instrument and the style of play, and to some extent on the frets. Generally the smaller instruments should have a height of between 1-2mm at fret 12, and the longer 2-3mm at fret 12.