File:Canadian transportation and distribution management (1913) (14782787524) (Unloading Ties from Box Cars).jpg

Identifier: canadiantransport1913 (find matches)
Title: Canadian transportation & distribution management
Year: 1913 (1910s)
Authors:
Subjects: Freight and freightage Shipment of goods Transportation
Publisher: Don Mills, Ont. : Southam Business Publications
Contributing Library: Fisher - University of Toronto
Digitizing Sponsor: University of Toronto

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Fig. i.—Layout of Buildings and Yard of (commonly called the B. M. process), andis the one almost universally employedw& ere zinc chloride is the antisepticmedium. In this process, to the zinc chlo-ride solution there is added aluminium sul-phate, the relation of the zinc chloride tothe aluminium sulphate being 2 to 1. As mentioned, zinc cholride forms an im-perfect solution in water, and the result-ant solution is more or less clouded fromthe presence of the suspended salts. Even a Modified Zinc Chloride Tie Treating Plant. aluminium sulphate, seems to be free fromleaching, as proved by experiments con-ducted by different authorities. A valuable feature about zinc chloridetreated wood is that it is fireproof, andwill only char slowly when subjected toflame. Wood so treated is affected veryslightly from an electrical standpoint.Shortly after treatment, the dissolvedsalts increase the conductivity of the tieto such a degree as to make necessary the
Text Appearing After Image:
Fig. 2.—Treating Plant, from the West. Fig. 3.—Unloading Ties from Box Cars. treated wood in some special substancesthat would add a waterproof coating to thesurface of wood, and thus make the in-terior free from the attacks of water.These various methods have all been usedwith more or less success, but have the ob-jection that any mechanical abrasion of thesurface leavesi the tie unprotected from theleaching that is sure to result. Another very decided objection to theordinary zinc chloride1 process is the factthat the zinc chloride salt is in a ratherimperfect state of solution in the treating with a very weak solution this is true. Itis a matter of chemical knowledge that ifa small amount of aluminium sulphate bepresent in the solution, the whole- of (hezinc sulphate is dissolved: in other words,the solution is no longer in a state ofequilibrium, but is a clear liquid. The re-sultant combined solution will not filter in,being forced through the pores of the woodinto the core. F

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