A 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. 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.
In the FAQ on the PRS site it says: We set-up the guitars at our factory with the following string gauges: Most solidbody instruments are factory set-up with 10 - 46 gauge strings. The DGT is factory set up with 11 - 49 gauge strings with unwound 3rd.
Lap harps have about 15-26 strings. Folk or lever harps have about 26 to 38 strings. Pedal harps can have from 40 to 47 strings. 40 strings are fine for some purposes, but in an orchestra you will probably want 46 or 47 strings. Incidentally, the 47 strings equal almost the range of the piano, minus the bottom two and top three keys, so C on the bottom to G at the top.