. Journal. h do not contain mercury. Unfortunately, arsenic, although used by somemanufacturers, appears to be of very little useunless in combination with copper, as inemerald green. One would anticipate from aknowledge of the properties of arsenic oxide andarsenious oxide that either one or the other, or ajudicious mixture of both, would be a suitablepoison for antifouling compositions ; but anyonewho has experimented with these materialswould soon part with any preconceived the writers opinion, they are practicallyuseless. In this short article it is neither desirable norpossibl
. Journal. h do not contain mercury. Unfortunately, arsenic, although used by somemanufacturers, appears to be of very little useunless in combination with copper, as inemerald green. One would anticipate from aknowledge of the properties of arsenic oxide andarsenious oxide that either one or the other, or ajudicious mixture of both, would be a suitablepoison for antifouling compositions ; but anyonewho has experimented with these materialswould soon part with any preconceived the writers opinion, they are practicallyuseless. In this short article it is neither desirable norpossible to deal with the great variety ofmaterials which has been pressed into theservice. Nor can the problem of keeping shipsbottoms free from corrosion and fouling beconsidered settled ; at the same time, however,good-quality compositions have achieved much,and shipowners can feel that under normaltrading their vessels bottoms will bekept in a reasonably good condition for periodsof from nine to twelve Fig. annexed photographs show more experi-mental plates and demonstrate how cautious onemust be in predicting the effect of materialswhen in the form of compositions. All theseexperiments were designed as improvements on ] REVIEW 49 5 B a well-known standard brand, whioh \i aspainted right across the top io Pig. 2 and the top right-haul strip in Fig. 3. Actual trial,which is the only reliable test, has shown themodifications to be wrong. Only by thisprocess of elimination can the best results beachieved. As in actual practice most vesselsare in dry dock on the average at least once intwelve months for purposes other than painting,the manufacturer of modern compositions can
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
