The Preservation of Structural Timber |
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absorption acid air seasoned attack blocks Burnett butt cedar cells cents chemical coal-tar creosote Creo creosote oil cross-ties cubic foot cylinder cars decay dipping distillation Douglas fir durability effect feet fireproofing Forest Products Laboratory Forest Service photo full-cell fungi heartwood heated impregnating wood Improvement in preserving injected kind of wood List of U. S. loblolly pine longleaf pine maple mercuric chloride method moisture open tank Patents on Wood pavement penetration percent piles placed Plate poles posts pounds per square practice preservative treatment preserving wood pressure protection pump rail red oak resistance retort salt sapwood seasoned wood secured serving wood shingles Shortleaf pine sodium solution species specific gravity spikes square inch steam strength sulphate surface TABLE temperature tests timber tion treated wood treating cylinder treating plant treating timber U. S. Forest Products U. S. Forest Service untreated varies wood preserving zinc chloride
Popular passages
Page 249 - The thermometer should be inserted in the retort with the lower end of the bulb one-half inch from the surface of the oil, and the condensing tube attached to the retort by a tight cork joint. The...
Page 78 - When 200 grams of the oil are distilled in accordance with the requirements of the specifications for the analysis of...
Page 75 - ... tar, oil or residue obtained from petroleum or any other source; it shall be completely liquid at thirtyeight (38) degrees centigrade and shall be free from suspended matter; the specific gravity of the oil at thirty-eight (38) degrees centigrade...
Page 249 - Reports shall be made on the following fractions : 0 to 170 degrees Centigrade. 170 to 200 degrees Centigrade. 200 to 210 degrees Centigrade. 210 to 235 degrees Centigrade. 235 to 270 degrees Centigrade. 270 to 315 degrees Centigrade. 315 to 355 degrees Centigrade.
Page 16 - ... moisture and of atmospheric air; that its action was provoked by oxygen, and that its method of action was by a communication of motion from the atoms of the infecting ferment to the atoms of the body infected. He denied that fermentation, putrefaction and decomposition were caused by fungi, animalcules, parasites or infusoria, although these organisms might sometimes be present during the processes. But he also stated that the phenomena of decomposition might be suspended by extreme heat or...
Page 248 - For taking samples during the process of treatment, it is desirable to take a sample of oil from the storage tank about one foot from the bottom of the tank before the cylinder is filled, and, where possible, a sample directly from the cylinder during the process of treatment. For this purpose a thermometer well, as shown in attached figure, is recommended.
Page 257 - The alkaline extract is then drawn off into a 100 cc cylinder and 25 cc more of hot sodium hydroxide added. After extracting with this second portion for 5 minutes, with frequent shaking, the solutions are allowed to separate and the alkaline extract added to the first portion in the cylinder. A third extraction is made with 15 cc of alkali. The total alkaline extract is cooled, acidified with sulphuric acid, thoroughly shaken, brought to 60°, and the volume of supernatant oil read off. Water. —...
Page 249 - Reports are to be made on individual fractions. In making such reports it is to be distinctly understood that these fractions do not necessarily refer to individual compounds. In other words, the fractions between 210 and 235 degrees will not necessarily be all napthalene, but will probably contain a number of other compounds. The distillation should be a continuous one, and should take about forty-five minutes.
Page 249 - Before taking the specific gravity the oil in the cylinder should be stirred thoroly with a glass rod, and this rod when withdrawn from the liquid should show no solid particles at the instant of withdrawal. Care should be taken that the hydrometer does not touch the sides or bottom of the cylinder when the reading is taken, and that the oil surface is free from froth and bubbles.