. The American beaver and his works. Beavers. BEAVER DAMS. 97 Length of Dam measured on the Crest Line. From station No. 1 to Station No. 2 (See Plate VIII.) 39 feet. " 2 " " 3 4-1 " " 3 " " 4 62 " lOin. " 4 " " 5 52 " " 5 '• " G 80 " " 6 " " 7 83 " Total Length 260 feet 10 in. Other Measurements. Height of structure from ground, or base line Depth of water in small pond be- low dam Differenoe of level of water above and below dam Height of water above base Approximate width of base, trans- ve
. The American beaver and his works. Beavers. BEAVER DAMS. 97 Length of Dam measured on the Crest Line. From station No. 1 to Station No. 2 (See Plate VIII.) 39 feet. " 2 " " 3 4-1 " " 3 " " 4 62 " lOin. " 4 " " 5 52 " " 5 '• " G 80 " " 6 " " 7 83 " Total Length 260 feet 10 in. Other Measurements. Height of structure from ground, or base line Depth of water in small pond be- low dam Differenoe of level of water above and below dam Height of water above base Approximate width of base, trans- verse sections Length of slope of poles, lower face of dam Length of slope of water face of dam Depth of water in pond at the end of slope 6 ft. 2^^ 1 ft. 5 ft. 6 ft. 18 ft. 13 ft. 7 ft. 6^^ 4 ft. No. 41^. 5 ft. 3^/ 1 ft. 4 ft. 5 ft. 15 ft. 11 ft. 9^^ 8 ft. 8 ft. 6^^ No. 3. 3 ft. 6'^ 3 ft. 2^^ 12 ft. 9 ft. 7 ft. 3 ft. No. 2. 2 ft. V^ 2 ft. 6 ft. 6 ft. 4 ft. 2 ft. The following figure represents a transverse section of the dam at the head of the great curve, Station No. 4, and distinguishes the part which is a solid embank- ment from that which consists of sticks and poles free from earth. Fig. Fole k 6tick wnrK BASE 18 Fr. Transverse section. Y A computation made from the preceding, and some additional measurements, shows that this dam con- 7. 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 Morgan, Lewis Henry, 1818-1881. Philadelphia, J. B. Lippincott & Co.
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Keywords: ., bookcentury1800, bookdecade1860, bookpublisherphiladelphiajblipp
