Page images
PDF
EPUB

records are also maintained for posts, poles, mine and structural timbers, paving blocks, and marine piling.

In addition to the studies of the Forest Products Laboratory on the effects of various preservatives in protecting wood from the gross effects of decay and insect attack, biological studies of these subjects are made by the Bureau of Plant Industry and the Bureau of Entomology, respectively, both of the Department of Agriculture. All three institutions cooperate with each other in the conduct of the work.

The American Wood Preservers' Association is a technical association of individuals interested in the preservative treatment of lumber. The objects of the association are briefly: The promotion of knowledge of materials, methods and principals involved in the operation of wood-preserving plants; and the standardization of specifications for wood preservatives and their introduction into the material to be preserved.

The association is composed largely of railway engineers, consulting engineers, and officials of public utilities, as well as individuals connected with wood preserving plants. Its standard specifications for the preservative treatment of timber have been adopted after many years of trial and service and these standards to-day are well known throughout the country.

The committee recommends that any problems relative to technical information on wood preservation, service tests, durability of wood, the uses of treated materials, etc., be referred to these agencies.

APPENDIX

Data shown in the appendix regarding amounts, kinds, and quantities of preservatives used in treating the various kinds of forest products were obtained from Quantity of Wood Treated and Preservatives Used in the United States in 1928. This report, prepared by R. K. Helphenstine, jr., can be secured from the Forest Service, Department of Agriculture, Washington, D. C. Valuable information and statistics pertaining to the wood-preserving industry as found in the above report, indicate the increasing importance of preservative treatment. It was compiled by the Forest Service in cooperation with the American Wood Preservers' Association, of Chicago, Ill.

TABLE 1.-Treating plants in the United States, by classes and types, 1928

[merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small]

? Plants owned by railroads for the treatment principally of railroad material. Plants owned and operated by light and power companies, mining companies, etc., to supply their requirements for treated wood.

TABLE 2.-Consumption of preservatives by the treating plants of the United States, 1909-1928, inclusive

[blocks in formation]
[graphic][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][ocr errors][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][ocr errors][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed]

TABLE 2.-Consumption of preservatives by the treating plants of the United States, 1909-1928, inclusive-Continued

[blocks in formation]

2 Shown previous to 1928 as gallons of various salt treating solutions and included with other miscel laneous liquid preservatives.

TABLE 3.-Comparative statement of material treated by open tank and pressure processes-1928

[blocks in formation]

TABLE 4.—Miscellaneous material treated, by classes and kinds of preservatives, 1928

[blocks in formation]

TABLE 5.-Wood blocks treated, by kinds of wood and kinds of preservatives,

[blocks in formation]

TABLE 6.-Number of poles treated, by kinds of wood and kinds of treatment,

187

50,000

500

932

1,044, 826 85, 341

187

50,000

[blocks in formation]
« PreviousContinue »