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Flight Path: 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.
In contrast to the GCA urveillance radar, which employs human oper-tors, it uses an automatic computer to track ach returning plane, thereby converting the sarch radar into many different tracking radars, mother automatic computer, called a schedule amputer, calculates the earliest nonconflicting me of arrival for each aircraft, and still anther set of computers, called flight path com-
puters, calculates the path which each plane must fly to arrive at the scheduled time and provides continuous instructions on the required heading and altitude. These instructions are relayed to each aircraft either by human operators over a voice radio or by an automatic radio data link. If the aircraft has an automatic pilot, the signals from the radio data link can be inserted into the automatic pilot system so that the airplane automatically maneuvers onto its required flight path. The Volscan system brings the stream of aircraft under its control into the precision approach landing patterrn of the conventional GCA.
See also AERONAUTICS—5. Aerial Navigation (Radio Navigation) : Ground-Controlled Radar.
Although paths have a practical purpose in your backyard, allowing you to move about it without wearing bald patches on the lawn or turning flower beds into mud baths, they don't have to look purely functional. They can be made to enhance the overall design, becoming features in their own right.
As WITH so many garden projects, a scale plan drawn on graph paper will be of tremendous help in planning the position and width of your path. Draw in all the major features and then try different positions for the path. Another way of doing this is to take a photograph of the site from the house and then use tracing paper to add an overlay showing possible path positions.
If you intend to use bricks or blocks as a paving material, you can sketch these in too and gain a much better idea of how the finished path will look. The pattern in which you lay the paving may require that some pieces are cut, in which case a carefully drawn scale plan of the path will show you just how many will need cutting and allow you to adjust this figure by moving the pattern here and there before actually doing the job. |
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