. The American florist : a weekly journal for the trade. Floriculture; Florists. up DETAILS OF HARRY SIMPSON'S NEW GREENHOUSE page 551. During the process of formation several foreign ingredients find their way into the coal. These are admixtures probably derived from spring water and from sea- water, to whose influence the coal was subjected. We will deal here only with two of these deleterious ingredients, sulphur and iron. Sulphur is by far the most injurious substance present in coal, and the presence of iron is important because of its direct action and also because it is a pra
. The American florist : a weekly journal for the trade. Floriculture; Florists. up DETAILS OF HARRY SIMPSON'S NEW GREENHOUSE page 551. During the process of formation several foreign ingredients find their way into the coal. These are admixtures probably derived from spring water and from sea- water, to whose influence the coal was subjected. We will deal here only with two of these deleterious ingredients, sulphur and iron. Sulphur is by far the most injurious substance present in coal, and the presence of iron is important because of its direct action and also because it is a practical indicator of the amount of sulphur present in coal, prac- tically all the sulphur being combined with iron as iron sulphide or pyrite. Sulphur.—Sulphur is the most objec- tionable deleterious ingredient of coal. Coal having a high percentage of sulphur should always be avoided. As has been stated, sulphur exists almost entirely as iron pyrite and iron sulphide. It can be seen often as glistening, brassy coatings on the natural surface of the coal where it has parted in the mine. Although these coatings aie conspicuous the quantity of sulphur thus introduced does not com- pare with the amount introduced in the thin grayish lines which extend parallel to the layers of coal. When pyrite is heated the sulphur is driven oS' as sulphur dioxide. This is objectionable because in the presence of moisture it forms sulphuric acid which rapidly corrodes the flues and boiler plates. The moisture may come from the moisture contained in the coal and air and often from steam escaping from the boiler itself In greenhouse boilers this is especially apt to occur on account of the intermittent firing, which allows plenty of moisture to collect in the flues. Investigations of boiler explosions have shown that in many cases the cause was directly traceable to flues and plates cor- roded by sulphuric acid. Iron.—When the sulphur is driven off from pyrite or iron sulphide the iron is left b
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectfloriculture, bookyea
