Railway, street railway, telegraph and telephone franchises can be granted only by the Executive Council with the approval of the governor, and none can be operative until it has been approved by the President of the United States.
That only absolute, all else relative to it, representative of it, operative by it..
The entire revocation of the muzzling order, which accordingly followed, proved, however, to be premature, and it became necessary to reimpose it in the districts where it had last been operative, namely, certain parts of South Wales.
In both cases the operative cause was the same.
If, instead of supposing the motion at dS to be that of the primary wave, and to be zero elsewhere, we suppose the force operative over the element dS of the lamina to be that corresponding to the primary wave, and to vanish elsewhere, we obtain a secondary wave following quite a different law.