Iron corrosion; anti-fouling and anti-corrosive paints . of the metal being discernible. More-over, the rust flakes themselves were far from uniform inintensity and shape, so that, here also, much still remainsto be elucidated, and a thorough investigation of the govern-ing conditions is necessary. From the practical point of view the actual cause ofrusting is a matter of indifference, and it is likewise im-material whether carbon dioxide plays any part therein ornot; we know that rust will form on iron, and we also 36 IRON-CORROSION AND ANTI-CORROSIVE PAINTS. know that rust, in whatever form
Iron corrosion; anti-fouling and anti-corrosive paints . of the metal being discernible. More-over, the rust flakes themselves were far from uniform inintensity and shape, so that, here also, much still remainsto be elucidated, and a thorough investigation of the govern-ing conditions is necessary. From the practical point of view the actual cause ofrusting is a matter of indifference, and it is likewise im-material whether carbon dioxide plays any part therein ornot; we know that rust will form on iron, and we also 36 IRON-CORROSION AND ANTI-CORROSIVE PAINTS. know that rust, in whatever form it appears, is a dangerousfoe to the metal. It was once said by a practical man that sooner or laterevery iron bridge must fall into the water, and even if thisstatement is not to be accepted literally, it neverthelessshows a full appreciation of the dangers incurred by ironstructures, especially bridges subjected to heavy loads, if theformation of rust be not prevented by every possible the occasion of the last great bridge accident (at Mon-. PiG. 20 (natural size).—Rust produced on rolled iron plate by common salt solution. chenstein, near Basle), an expert stated that it appearscertain the bridge was not kept in proper condition, butthat rust, that foe to all iron structures, had been allowed togain the upper hand. Under certain conditions the rustingaway of a few rivet heads will suffice to dangerously weakensuch a structure as this, possessing but a minimum marginof safety. As a matter of fact it is not by the degree of rustingexperienced by the massive constituents of iron bridges— IRON-CORROSION AND ANTI-CORROSIVE PAINTS. 37 such as the rolled girders, connecting pieces, stays, ties andsuch like large and visible portions—that the safety andstrength of the en|;ire structure is to be measured ; but itrather becomes a question of properly preserving the smallestcomponent parts, present in very large numbers. In all iron
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