. Electric railway journal . Dipping the Butts of Poles This preservative is a germicide whose preservative action isdue to the presence of antiseptic high-boiling (above 300deg. C.) coal tar oils which remain in the timber while low-boiling oils would either evaporate or leach out. At 300 it has a liquid coal tar residue of at least 92 per cent,. Tie-Treating Plant in Denver according to the method of analysis used by the UnitedStates Forest Service. It is said to be absolutely free frompill oleum residue, the presence of which might mislead thechemist on account of iis influence on th
. Electric railway journal . Dipping the Butts of Poles This preservative is a germicide whose preservative action isdue to the presence of antiseptic high-boiling (above 300deg. C.) coal tar oils which remain in the timber while low-boiling oils would either evaporate or leach out. At 300 it has a liquid coal tar residue of at least 92 per cent,. Tie-Treating Plant in Denver according to the method of analysis used by the UnitedStates Forest Service. It is said to be absolutely free frompill oleum residue, the presence of which might mislead thechemist on account of iis influence on the specific gravity andthe amount of distillate at 300 deg. C. It is possible to obtain a lower distillate than 8 per cent, but such an oil would beunfit to use for timber preservation because it would solidifyon cooling or when it reached a normal temperature. One of the most important railways using C. A. WoodPreserver is the Denver City Tramway Company which hastreated about 200,000 ties as well as a large number of September, 1904, the company laid its first ties treated ac-cording to this method. For purposes of experiment, it alsoinstalled a number of untreated ties under the same 1909, specimens of both ties were removed by the manage-ment and presented to the preservative company for exhibitionat the October conventi
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