. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture. Fig. 49. — Showing a square cavity filled with cement. D, disintegrated bark above and below the filling; E, general path of plas- tic or healing substances; F, bark cut to point to accommodate the process of heal- ing and conforming with the path of heal- ing substances. sectional work. With the judicious use of iron bolts (which should in our opinion be independent of the sections) in order to secure rigidity, the sectional cement method has proved superior to the older methods of filling cavities, since it has done awa
. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture. Fig. 49. — Showing a square cavity filled with cement. D, disintegrated bark above and below the filling; E, general path of plas- tic or healing substances; F, bark cut to point to accommodate the process of heal- ing and conforming with the path of heal- ing substances. sectional work. With the judicious use of iron bolts (which should in our opinion be independent of the sections) in order to secure rigidity, the sectional cement method has proved superior to the older methods of filling cavities, since it has done away with much miscellaneous cracking and dislodgment of fillings. Much improvement in the quality of the cement work done on trees has been made within the last few years, especially in cement technique, and some of the Portland cement surface in cavities is excellent. A great deal of puttering and detail work such as thorough tamping and troweUng of the cement is often done in tree cavity work, especially when the contract is for work by the hour. Thorough tamping and troweling improve the cement, and as a result of this frequent time- killing process practiced by certain unscrupulous workers some of the best individual examples of cement technique may be found in trees. Wliile the sectional method of filling cavities with cement has caused. 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 Massachusetts Agricultural Experiment Station. Amherst, : Massachusetts Agricultural Experiment Station, 1907-1974
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