Wave Propagation Path. Maxwell's electromagnetic wave theory had made it possible to calculate how radio waves would diffract around the conducting curved surface of the earth. In 1901, Marconi's transatlantic signaling showed that something more than diffraction must be involved in the long-distance propagation of radio waves. One year later Oliver Heaviside (q.v.) and Arthur Kennelly (q.v.) both suggested that a conducting layer of ionized gas high in the earth's atmosphere would help to explain Marconi's feat.
The arrangement of paving units in a path can subtly affect the speed at which you walk. A uniform grain along the path—for example, that created by bricks laid lengthwise in stretcher bond—can seem to hurry you on, whereas a less directional pattern will encourage a slower pace. The treatment may be chosen to suit the purpose of the path—a "slow" path where there is plenty to admire, a "faster" path where the aim is simply to provide access to another part of the garden.
The only variable feature of this form of propagation is timing. As a general rule, the best time is directly after flowering, as this is when the new vegetative shoots are being produced and the new root system is developing. In very late-flowering subjects, spring propagation is advised.
Wave Propagation Path. Maxwell's electromagnetic wave theory had made it possible to calculate how radio waves would diffract around the conducting curved surface of the earth. In 1901, Marconi's transatlantic signaling showed that something more than diffraction must be involved in the long-distance propagation of radio waves. One year later Oliver Heaviside (q.v.) and Arthur Kennelly (q.v.) both suggested that a conducting layer of ionized gas high in the earth's atmosphere would help to explain Marconi's feat.