Iron corrosion; anti-fouling and anti-corrosive paints . 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 ir
Iron corrosion; anti-fouling and anti-corrosive paints . 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. Fig. 21 (natural size).—Rust developed on rolled iron plate by fourteendays exposure to atmospheric action. structures an important function is discharged by the rivets,which have to unite the individual plates, stays, girders, etc.,which in turn are jointed, screwed, etc., together. If rust isallowed to gain a foothold in the rivets and screws therigidity of the entire structure is imperilled. The rusting ofone, two or more rivets in a girder, stay, etc., will not 38 mON-COEROSION AND ANTI-COREOSIVE PAINTS. endanger safety, provided there are plenty of others stillsound ; but, if suitable care be not exercised, the whole ofthe rivets and screws may become rusted, and then thedanger begins. Everybody knows that an invisible crack isoften sufficient, if filled with water and then frozen, to causea large stone to split asunder, and a similar thing occurs inrivets, a probably imperceptible space between the rivet headand the iron plate sufficing to admit water, set up rusting,and facil
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