Report Showing Progress of Work to January 1 1881
Report Showing Progress of Work to January 1 1881
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24. The poles of each set are to be spiked solidly down upon the tree trunks below, and the trees of each layer are to be solidly spiked down to the poles upon which they rest. Tree nails of hard wood may be used in this fastening, or iron spikes of sufficient length to take at least two and a half inch hold may be used.
25. The upper apron, laid partially below and partially above the natural surface of the ground, is to be next built/ in each division or subdivision of the work. As shown in t...he sec- tional drawings, this apron rests partly on the lower apron and partly on the ground, up stream from it.
26. It is to be composed of the same class of materials as the lower apron, and laid in the following manner: Small trees or trunks of trees, varying from fifteen to twenty-five feet in length in the average sized structure (and of greater or less length, as shown in the drawings for larger and smaller sections), and six to nine inches thickness of butt are to be laid close together lengthways up and down stream, in layers sloping dowi.
What to read after Report Showing Progress of Work to January 1 1881?
You can find similar books in the "Read Also" column, or choose other free books by California Drainage District No1 Board of Direc to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
24. The poles of each set are to be spiked solidly down upon the tree trunks below, and the trees of each layer are to be solidly spiked down to the poles upon which they rest. Tree nails of hard wood may be used in this fastening, or iron spikes of sufficient length to take at least two and a half inch hold may be used.
25. The upper apron, laid partially below and partially above the natural surface of the ground, is to be next built/ in each division or subdivision of the work. As shown in t...he sec- tional drawings, this apron rests partly on the lower apron and partly on the ground, up stream from it.
26. It is to be composed of the same class of materials as the lower apron, and laid in the following manner: Small trees or trunks of trees, varying from fifteen to twenty-five feet in length in the average sized structure (and of greater or less length, as shown in the drawings for larger and smaller sections), and six to nine inches thickness of butt are to be laid close together lengthways up and down stream, in layers sloping dowi.
What to read after Report Showing Progress of Work to January 1 1881?
You can find similar books in the "Read Also" column, or choose other free books by California Drainage District No1 Board of Direc to read onlineMoreLess
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