Agriculture Review
This historic book may have numerous typos, missing text, images, or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1901. Not illustrated. Excerpt: ... tiles that are flattened, bent, or warped, or tiles with rough ends. It is self-evident that the best drains cannot be made from tiles with these characteristics. The burn is of importance chiefly as affecting the durability. Tiles which are under-burned are soft and likely to crumble. Such tiles when struck with a trowel or hammer give a dull sound, while those which are properly burned give a sharp, ringing sound. On the other hand tiles are sometimes over-burned. Such tiles will be durable but they are commonly under-sized and therefore undesirable. In arranging for the purchase of any considerable quantity of tiles it should be carefully stipulated that all the tiles furnished shall be perfect, and the right to throw out such as are not up to the standard should be reserved. One poor tile in a drain may render the whole drain useless. When drain tiles first came into use it was regarded as essential that the tiles should be porous in order that water might find its way through them. It is now known that this is unimportant. Practically all the water enters at the joints. Some makers of recent years are turning out tiles which are glazed, sometimes inside only, sometimes inside and out. Glazed tiles must be regarded as distinctly superior to those which are not glazed. The inside glazing gives a smoother and harder surface. There is less friction, the water flows with greater velocity and there is consequently less liability to obstruction, while the capacity is increased. Tiles glazed both inside and out must be much more durable than those which are not glazed, as they will be less affected by the agencies which tend to cause disintegration. XXXVII POINTS TO BE SETTLED BEFORE THE DRAINS ARE PUT IN. 230. What these points are -- Whatever the kind of... Read more...
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