Witli tlic incrensiiig indust~riiil iisc of tiictnls ntid alloys, tltc prcvciitioli of corrosion Iins ite turnlly coninitindcrl incrcnsitig nttcnt.ion. Intcnsivc resenreti on corrosioti problcms nndcrtnketi during tltc war scrvctl in coiisitlcr-. nLlc iiicnsiirc to stimulnte the grcnt nct,ivity wIiicIt has ilc~clopecl ~vitliiti tlic pnst tlccndc in this field, interest. in wliicli tins tic-cr IJCCII so pronoit~icetl its it is to-dny.
Althougli scvcral cscclleiit h o o h on corrosion Itnvc bccii ~vrittcn collectitig tlic IIC~CI: infortiintion wliicli litis bccome nvnilnblc, no outstantling book tins ~~rcviously nppenrcrl denling csclusi\dy with tlic siibject of protcctive mctnllic contii1g.s. Nr. Rnwloii's book t,licrcforc fills tlic I' long-felt m i i t " ivl~icli tipologctic nut.hors of test-books wcrc wont a t oiic titiic to clnini for tltcir work.
Tlic prcsciit work cotistitiites oiic of the csccllcnt Scrics of Scientific n i d Teclr~~ologic Jlonogrnpl~s, whicI1 is behg piiblislicd by tltc Amcricnn CIicniicnI Society. Thc objects of tlicir pi~blicntioii arc, firstly, to p ~x i i t nvnilnlh kno~rlcdgc 011 n givcn siibjcct in a rcnd:il)lc foriii: " intclligiblc to tliosc \vliosc ttctivitics iiiny be nlong n wholly diffcrcnt liiic," ntrd, sccoticlly, " to proiiiote rcsenrcli i n tlic brnuclr of scicticc co~crccl by tllc nionogrnpli by furiiisliing n \rcll-tligcstctl survcy of tllc progrcss nlrently iiindc in that field, niitl by pointing out directions in which iiivcst,igatioii necds to be cxtciided." Xr. Rn\vdon tins succccdcd in rcnlising tliese objects, niid :iltlioiigli in piirsi~iiig tlic first niiit, ns stated in the prcfncc, ccrttiin port,ions ol tlic discussioti iiiny o p ~~a r to tlic spccinlist ns soiiicwliiit clciiiciitnry, it is dnc to this wry spccinlisntioti in britnclics of tlic sttbjcct t.lint tlic spccinlist, will fitid n grcnt ilcnl of ~~~l i i n b l c iiiforiuatioti i n otlicr brniiclics ~vlticlt, if iiot nltogctlicr IICW to hiin, scrvcs to clnrify hnzy iniprcssions iiittl to rccnll linlfforgotten fncts. I t is Lccotning iiiorc :iiitl tiiorc cssciitinl for the speciiilist, say, in clcctrotlcgosition, to Itiivc iiiorc than n gciicrnl kno\vlcdgc of " 1iot-tlij)piiig ?' :ind cciiicntntion proccsscs ; while it is itot suflicicitt to