Much depends on the point at which we decide that RP came into existence. William Gladstone, who was PM for four different terms in the late 19th century, went to Eton College yet his pronunciation gave away that he was from the North of England and his speech was criticised by RP speakers in the early 20th century.
Definition of vane. 1a : a movable device attached to an elevated object (as a spire) for showing the direction of the windb : one that is changeable or inconstant.
Total Harmonic Distortion, or THD is an amplifier or pre-amplifier specification that compares the output signal of the amplifier with the input signal and measures the level differences in harmonic frequencies between the two.t is also reproducing harmonics of that frequency that are multiples of the fundamental frequency, such as 880Hz, 1220Hz, 1760Hz and so on. Each of the harmonic frequencies is lower in level or volume than the fundamental, but they serve to give each instrument its unique sound.