According to (18), the effect of the force acting at dS parallel to OZ, and of amount equal to 2b2kD dS cos nt, will be a disturbance - dS sin cos (nt - kr) (20), regard being had to (12).
At B there is no displacement, but at K there is displacement towards B represented by KR, i.e.
These are of the value of 10, 50, loo and Soo kr.
Thus by equation (18) of § II of the article Diffraction Of Light, the secondary disturbance is expressed by D' - D n 2 Tsin sin (nt - kr) D 47rb2 r _ D' - D irTsin O sin (nt - kr) (3)1 The preceding investigation is based upon the assumption that in passing from one medium to another the rigidity of the aether does not change.
The speed at which a circuit can be worked depends upon what is known as the " KR " of the line, i.e.
