摘要:

AbstractCorrosion in H.M. ships' machinery is shown to present a series of constantly changing problems as greater speeds and efficiency are demanded. Partly as a result of the vast experience accumulated through the strenuous conditions of war‐time operation, current problems are not very numerous but are spread over a wide range of environments. To illustrate this, examples are cited from sea‐water, distilled‐water, steam, hydraulic‐fluid and forced‐lubrication systems and of surfaces subjected to fuel‐oil combustion products and damp atmospheres. The components considered include Diesel‐engine cylinder liners, boilers, chromium‐iron turbine blading, various non‐ferrous components in steam lines, cylinders and bearings in hydraulic fluids, and gearing and bearings in forced‐lubrication systems. Remedial measures are discussed and some recent innovations to reduce corrosion are described. It is emphasized that sea‐water contamination and periods when machinery is standing idle are two major factors that influence the liability to corro

ISSN:0021-8871    

DOI:10.1002/jctb.5010040301

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractFormamide (20% concentration) has the specific property of considerably increasing the germ‐icidal power of the saturated fatty acids. The adsorption of the acids by activated charcoal is, however, diminished in the presence of formamide, except when the amount of adsorbent is small; an increase is then sometimes observed. Acetamide and glycol also diminish the adsorption of acetic acid, but to a somewhat less extent than formamide. The bactericidal power of trichloroaoetic acid is reduced by formamide and the adsorption by charcoal is also diminished.isoPropyl alcohol, unlike formamide, does not exhibit a specific effect on the bactericidal action of acetic acid; acetone, acetic acid, and certain esters are influenced to much the same exten

ISSN:0021-8871    

DOI:10.1002/jctb.5010040302

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractPhenoxymethyl and phenylthiomethyl chlorides are readily converted into the corresponding thiocyanates by interaction with potassium thiocyanate in acetone or alcohol. The compounds thus obtained possess the thiocyanate and not theisothiocyanate structure. 2: 4‐Dichlorophen‐oxymethyl thiocyanate undergoes isomerization to theisothiocyanate on distillation under reduced press

ISSN:0021-8871    

DOI:10.1002/jctb.5010040303

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractPhenoxymethyl chlorides react readily with tertiary amines to give well‐defined quaternary salts, many of which show considerable bactericidal activity. Phenylthiomethyl chlorides react similarly but more slowly. The quaternary salts break down on heating with dilute sodium hydroxide solutio

ISSN:0021-8871    

DOI:10.1002/jctb.5010040304

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractThe use of bromine water to oxidize to sulphates any sulphites in the incinerated mixture, when determining the sulphur content of coal or coke by the Eschka process, has been customary since the method was devised by Eschka in 1874. It has been shown that, although this was necessary with the heating ‘lamp’ used by Eschka for the incineration (a methylated‐spirit lamp is employed as the modern equivalent), it is no longer necessary when a temperature of 700° is attained, as is the case with a Bunsen burner or (British Standard recommendation: B.S. 1016: 1942) a muffle furnace operated a

ISSN:0021-8871    

DOI:10.1002/jctb.5010040305

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractIt is shown that an electrode made from a membrane (actually a short length of 2‐mm.‐diameter rod) of a cation‐exchange resin of the sulphonated‐phenol type and containing a reference electrolyte of fixed concentration, gives steady and reproducible e.m.f. values when immersed in solutions of the same electrolyte of other concentrations. Between certain limits of concentration, different for every electrolyte, the e.m.f. values are those predicted by the Nernst equation when the activity functions are put equal to the mean ionic activities of cation and anion in the electrolyte solution.The upper limit of conformity with the Nernst equation is determined, at least qualitatively, by the ratio of the mobilities of cation and anion within the resin phase, as predicted by the Meyer&Sievers and the Teorell equations. With some limitations the electrode can be used to measure unknown ionic activities in solution in a manner similar to that of the glass electrode, and the activity coefficients of potassium ferrocyanide in solutions of 0·02–0·001M are measured in this way.Unlike the glass electrode for the hydrogen ion, the resin electrode is not specific for any one ion, and measurements with solutions containing two cationic species show the effect of the contributions from both species to the

ISSN:0021-8871    

DOI:10.1002/jctb.5010040306

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractFifty‐five samples of British rocks of restricted petrological type, namely quartz‐dolerite, were examined petrographically and by mechanical testing. No general correlation was found between mineral content or grain‐size and test results. Considerable correlation exists, however, between the test values and geological occurrence; the specimens from the Whin Sill generally yield test results superior to those from Scottish Permo‐Carboniferous sills, whereas samples from Scottish dykes of Permo‐Carboniferous and Tertiary age respectively form intermedia

ISSN:0021-8871    

DOI:10.1002/jctb.5010040307

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractThe ‘bromination‐excess’ method has been made applicable to the rapid determination ofo‐cresol, 4‐chloro‐2‐methylphenol and 2‐methylphenoxyacetic acid. An alternative ‘direct’ bromination method has also been used in which the end‐point is detected electrometrically. The methods can be applied in the presence of 4:6‐dichloro‐2‐methylphenol and chlorinated 2‐methylphenoxyacetic acids. Slight modifications to the procedure are necessary in the presence of certain solvents,

ISSN:0021-8871    

DOI:10.1002/jctb.5010040308

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY

摘要:

AbstractThe Mackey test has been considered from the point of view of its suitability as a general method for assessing the spontaneous heating and ignition hazards of materials that are subject to atmospheric oxidation at ordinary temperatures.An experimental study has shown that there is an optimum packing density for self‐heating in specimens of oiled fibre in the Mackey tester.It is considered that the test may, to a limited extent, be adapted to give an indication of relative hazard for a wider range of materials than the textile oils for which it was originally designed. But materials must be compared under the optimum test conditions for spontaneous heating in each, and the extent of the investigation involved in satisfying this requirement reduces the practical value of such an application of the test. Nevertheless the test is of value in that it can be expected to show whether spontaneous heating is at all possible in any solid materia

ISSN:0021-8871    

DOI:10.1002/jctb.5010040309

出版商:John Wiley&Sons, Ltd    

年代:1954

数据来源: WILEY