PROCEEDINGS 



PHILOSOPHICAL SOCIETY OF GLASGOW. 



MABCH 7, 186 0. 



Db. Andebson", the President, in the Chair. 

 Mr. Edward M. Dixon, Teacher, was elected a member of the Society. 



On the Incrustation of Ma/rine Boilers. By William Wallace, 



Ph.D., F.C.S. 

 Having given some attention to the subject of Mr. James E. Napier's 

 paper on the " Incrustation of Boilers using Sea-water," read at the 

 meeting of the Philosophical Society on the 18th of January last, and 

 which is a chemical as well as a mechanical one, I may be able, perhaps, 

 although I have not had an opportunity of prosecuting practical experi- 

 ments, to make some suggestions which may be useful. 



The first point which presents itself for inquiry is the composition of 

 the water employed. Many analyses have been published, showing the 

 composition of sea-water at different places. From these it appears 

 that the ocean varies much in composition at different points, so that 

 no analysis can be taken as the basis of calculation, to find the amount 

 of any chemical compound required to prevent the formation of crust 

 in steamers plying in various parts of the globe. The following ana- 

 lysis of water, taken off A.ilsa Craig, may probably be accepted as giving 

 a tolerably accurate idea of the composition of the water in the Irish 

 Channel and the West Coast generally. A gallon of the water weighed 

 10'2521 lbs., and contained the following ingredients, represented in 

 grains : — 



Sulphate of Lime, 101-71 



Sulphate of Magnesia, 



Sulphate of Potash, 

 Chloride of Sodium, . 

 Chloride of Magnesium, 

 Bromide of Magnesium, 

 Carbonate of Lime, 

 Carbonate of Magnesia, 

 Alumina and Phosphate of Lime, 

 Silica, .... 



126-97 



48-92 



1910-36 



202-41 



3-15 



3-36 



-95 



2-67 



1-50 



Vol. IV.— No. 7. 



2s 



2402-00 



