Preservation of Bridge Timber.
One of the most encouraging among the various methods which have been brought forward for the preservation of bridge timber and railroad ties would seem to be that which, in the first place, subjects the finished timber to an adequate dry heat, and then immerses it in a hot bath composed of certain proportions of asphalt and carbolic acid. The effect of this treatment is that, on cooling, the solvent of the asphalt evaporates, leaving a skin or coating of asphalt on the surface of the wood which resists water and keeps the antiseptic material fixed secuiely within the pores of the wood. The exterior of the wood, on the completion of this process, presents a smooth and dark surface requiring no paint.
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Waikato Times, Volume XXII, Issue 1806, 2 February 1884, Page 2 (Supplement)
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127Preservation of Bridge Timber. Waikato Times, Volume XXII, Issue 1806, 2 February 1884, Page 2 (Supplement)
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