|
 |
 |
|
Unit Blocks Known: A large area of paving blocks likely to receive considerable traffic should be bedded on mortar on a prepared foundation. Start to lay the blocks in one corner of the patio and work diagonally across the surface. This makes it easier to ensure that they are laid consistently flat. Place i/zin thick offcuts of wood between the blocks as consistent joint spaces, or simply butt up the blocks for finer joints. As you work across the surface, kneel on a piece of board to distribute your weight.
THE MATERIALS you choose should blend in with their context. There are many types of bricks, blocks, pavers, walling blocks, and paving blocks which are all suitable. You can use bricks and blocks both for the risers and for the treads; face textures may be smooth, pitted or, in the case of decorative cement blocks, resemble split stone. Blocks, although suitable only for the treads, may be smoothfaced, riven, or even geometrically patterned for an ornate appearance.
SKETCH OUT the position and shape of the steps on squared paper to help you to determine how they will look and how they will fit in with the existing site plan erhaps the most important point is to draw side elevation of the steps, which will show ou just how steep they will need to be. bu will have to take into account certain ifety criteria with regard to the format. If le flight is too steep, it will be tiring to limb. Where it is too shallow there is a anger of tripping.
Another Frenchman, the abbot Rene Just Hauy (1743-1822), explained the constancy of the angles between the faces by the stacking of tiny unit blocks known today as unit cells. He also described the seven basic crystalline systems [2-8] and the principles of their symmetry. What transformed crystallography from a side branch of mineralogy into an essential branch of physics was the discovery, in 1912, of the internal structure of crystals through the phenomenon of X-ray diffraction [9] by Max von Laue (1879-1960), a German physicist, and, jointly, by the British physicist, William Braggg (1862-1942), and his Australian son Lawrence (1890-1971). |
|
|
| |
|
|
|
|
