. Agricultural engineering; a text book for students of secondary schools of agriculture, colleges offering a general course in the subject and the general reader. Agricultural engineering. 470 AGRICULTURAL ENGINEERING blocks are of the same material and have the same character- istics as brick; in fact, in certain localities they are called hollow brick. If these blocks are of good mate- rial and hard-burned they are very durable. The 4x8xl2-inch block has proven to be a very satisfactory size. Larger blocks are too large to handle with one hand, and smaller ones require more labor in laying.
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. Agricultural engineering; a text book for students of secondary schools of agriculture, colleges offering a general course in the subject and the general reader. Agricultural engineering. 470 AGRICULTURAL ENGINEERING blocks are of the same material and have the same character- istics as brick; in fact, in certain localities they are called hollow brick. If these blocks are of good mate- rial and hard-burned they are very durable. The 4x8xl2-inch block has proven to be a very satisfactory size. Larger blocks are too large to handle with one hand, and smaller ones require more labor in laying. These blocks are laid on edge, making a four-inch wall. The Cement Wash. If curved blocks are used and care is used in point- ing and filling the mortar joints, the wall will.be suf- Fig. 296. The Iowa silo made of hollow nCiently Smooth On the m- vitrified clay building blocks or tile. ^ ^ omit the plastering. To seal the mortar joints and make the whole impervious, a cement wash should be applied before the mortar becomes hardened. Reinforcement. The entire bursting pressure of the silage should be carried by steel wire imbedded in the mortar joints. Number 3 wire has been found to be a very satis- factory size. It is small enough not to interfere with the laying of the blocks, and fewer strands are required than of the smaller sizes. This wire should be unannealed, and may be straightened to the curvature of the silo by drawing it through a piece of pipe bent to the proper angle.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Davidson, Jay Brownlee, 1880-1957. St. Paul, Minn. , Webb Pub. Co.