PREFACE - protection is afforded by oil paint-a large number of soi-clisccnt positively infallible anti-corrosive paints claiming to ensure illimitable durability, though the experience gained by their use in many critical instances has been tlie reverse of favourable. The same fate has attended tlie use of ordinary oil paints, because, despite the teachings of experience, it has been the custom to look upon - p ainting-especially - laying on the first coat-as a merely formal matter, and to attempt to economise, both in material and workmanship, by buying the cheapest paint and 2 entrusting the work to day labourers. The International Congress for tlie unification of metllods of testing building 2nd other structural materials has been the means of again raising the cluestion of iron corrosion, and afforded the author, wlld hqd long been collecting data on the sobject, an 4-opportunity of occupying. I-himself thoroughly wit11 the question. The illustrations of the rusting of iron given in the following pages were preparecl in the course of a series of personal experiments on the formation of rust, the results of which are now embodied with the experience gained in reference to anti-corrosive paints, so that I may hope to have presented in the present work a fresli contribution towards the solution of this important problem. LOUIS EDGAR AND S. Iri111 1Lrlbt a illi ts Fcirmation - Tlic Irotcctiol of 1ro11f r1 11Ili s t i u Iry g tl cI, p plicsrivn I ot. tc miugo r 1. ouudillq t l cIr on - H o t t o i iv i gll i lst Ucicl l I I V a r11ih11 - Fi islii G i n q a ts of I z i 01 t 1 1ro11 - 11 plying T L II - L - N I I I o f ICCoYnt s of Oil Iai111 lc st i I t g i t l t h - TIICL - sc i d Tarfor I L L I I L J I I UI ru n, . i i-i, orros i v L is I I S L - I - I P I I I T a i h - Colr positiriil io f lit i-cci, t. osi. Ic aint. I, i lsoetl Varliisll - I r l a ic r . 5 t nf L good Li rst, c. dV ar i I hl - . tlultcratiol v i t l1 c silr - lhc 1 ctc-c, tion c f I - lboilcdL inseed Oil - clultcril iow it1 1 I isl1 Oil - I ctectiol o f 3Iincral Oils. Lctrolcutll I crivutivc, .1tlultcratiull wit11 liesin Oil - Iktcction of 1 rit. - r-. - Cltiucsc Wood Oil - - - - - Ligmcnts-Leacl Pigincnts - WhitcLcad - lied Lead - - - - Zinc Pignlents - Ziuc Wllite - - - - - - Zinc Grcg - - - . - . . Litl opoee - Iron Pigments - . - - - Natural Iron Pigmcnts - - - Iron RIiniuin - - - Iron Oxides of Scaly Appearance - Spathic Iron Ore - . . Artificially prepared Oxides of Iron - - . Carbon - - - - - . - - lllllil l l - llllillll ll i l h l lll. f ll., , I r . I l u - L IOI III 1 Y 1 I I i l i l 1, I 111111. I1o1t . i. 1 1. iil 111 1 I. III II LII, . it 11 L IILIISI LII I LIII I, I 5 111 I, I III L II I, II 17. I L i s t1 o1.111, l 1 5,111 I IiLIl t I I I 1 1 1110. 111 1 1 11, - l . 1 11 t IO I. IIICIL 1-S lI 5oI11tivt1 O II I OIIII-IIIU I 1 I I tr III L II I, - l. I11lst fo11111 1l Sit11 SII III 11111 1 1 1 1 l i o l l t . t l 11,1111 I l i t c, . . . V111 LIST OF ILLUSTRATIONS. FIG. PAGE 28. Thick Rusty Incrustation on Wrought Iron through Exposure to Air 44 29. Wrought Iron Pipe Corroded in the Soil - - - - - - 45 30. RustPittingsinTinnedSheetIron - - - - - - - 46 31. Rust Pittings in Tinned Sheet Iron - - - - - - - 46 32. RustPittingsinTinnedSheetIron - - - - - - .. 47 33. Rust Pittings in Tinned Sheet Iron - - - - - - - 47 34. Rust formed by Concentrated Hydrochloric Acid on Scoured SheetIron - - - - - - - - - - - 35. Rust formed by Concentrated Hydrochloric Acid on Scoured Sheet Iron magnified - - - - - - - - - - 36...