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.
Chimes, bells, and xylophone are examples of fixed-pitch percussion instruments. These instruments have a definite pitch, but the pitch cannot be tuned or changed by the player. Usually, fixed-pitch percussion instruments are arranged in sets, similar to the layout of a piano keyboard.here are three basic types of percussion instruments. Instruments such as the snare drum and cymbal are of indefinite pitch. The sound they produce has no specific pitch and works with any harmony or key that the band might be playing.