. New England trees in winter. Trees; Trees in winter. ?AG NEW EXGLAND TREES IX WINTER. Fig-. 3. Height Measurer in position for sighting- to base of tree. respectively. In figure 2, the eye is assumed to be on the level with the base of the tree and only a single sight is necessary. In figure 3, the base of tree is below eye level and the distance CD must be found by a downward sight and added to the reading olitained for BC'. It can be readily seen from inspection of the figures that the method is based upon the similarity of the triangles ABC and ACD with the smaller triangles abc a
. New England trees in winter. Trees; Trees in winter. ?AG NEW EXGLAND TREES IX WINTER. Fig-. 3. Height Measurer in position for sighting- to base of tree. respectively. In figure 2, the eye is assumed to be on the level with the base of the tree and only a single sight is necessary. In figure 3, the base of tree is below eye level and the distance CD must be found by a downward sight and added to the reading olitained for BC'. It can be readily seen from inspection of the figures that the method is based upon the similarity of the triangles ABC and ACD with the smaller triangles abc and acd. Two general habit types are recognized—the spreading and the erect—often termed delicpiescent and respectively. The former is well represented by the Apple (p. 487) and White Elm (p. 461) and the latter by the Evergreens and those of the Poplars that form narrow conical heads (p. 395-307). By its more erect habit of growth the Sweet Cherry (p. 503) is readily distinguished from the Sour Cherry (p. 505) and in like manner the Pear (p. 485) from the Apple (p. 487). It is these habit differences that form the most ready means of separating the contrasted trees just mentioned which may closely resemljle each other in twig char- acters. The angle which the branches make with the trunk is frequently a diagnostic character of considerable value. For i'-\ainple, the ascending and gracefully outward curving limbs of Hie Ameiican White Elm (p. 4G1) stand in contrast with the sharply divergent limbs of the English Elm (p. 45!)). Likewise the horizontal branches of the Tupelo (p. 555) and the strongly pendant liiwer limbs of the Swamp White Oak (p. 43!)) are characteristic of these species. The relative thickness of the ])ranchlets contrasted. 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 Blakes
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttrees, bookyear1911
