principal scale การใช้

• To counter this, some meters include a mirror along the markings of the principal scale.
• Thus, the tone becomes richer and fuller as the pipe's diameter widens from string scale to principal scale to flute scale.
• When the principal scale is small, i . e . for a very fine foam, this dispersed medium can be considered as a type of colloid.
• The scale is true ( k = 1 ) on the equator so that multiplying its length on a printed map by the inverse of the RF ( or principal scale ) gives the actual circumference of the Earth.