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No more effervescence and hissing tumult as he pours his sharp thought on the world's biting alkaline unbeliefs! No more corrosion of the old monumental tablets covered with lies! No more taking up of dull earths, and turning them, first into clear solutions, and then into lustrous prisms! I, the Professor, am very much like other men: I shall not find out when I have used up my affinities.
These sources of injury, however, admit of easy remedy; the top of the boiler may be preserved from external corrosion by covering it with felt upon which is laid sheet lead soldered at every joint so as to be impenetrable to water; the ash pits may be shielded by guard plates which are plates fitting into the ash pits and attached to the boiler by a few bolts, so that when worn they may be removed and new ones substituted, whereby any wear upon the boiler in that part will be prevented; and there will be very little wear upon the bottom of a boiler if it be imbedded in mastic cement laid upon a suitable platform.
So long as the zinc surface remains intact, the underlying metal is protected from corrosive action, but a mechanical or other injury to the zinc coating that exposes the metal beneath, in the presence of moisture causes a very rapid corrosion to be started, the galvanic action being changed from the zinc positive to zinc negative, and the iron, as the positive element in the circuit, is corroded instead of the zinc.
Now add to the corrosion of the membrane and the paralysis of the brain-centres from alcoholics the other inciting causes in the culture of disease, and you have the evolution of the drunkard. How is he to be cured? Only through a fast that shall let that diseased stomach become new from regeneration, that will let the brain accumulate rest in reserve.
The calcareous concretions formed in the calciferous glands, which are often found in their gizzards, intestines, and occasionally in their castings, when of large size, sometimes appeared to have been rounded; but with all calcareous bodies the rounded appearance may be partly or wholly due to their corrosion by carbonic acid and the humus-acids.
You must not look mournfully on the past, but forward into a brightening future." "I have but one object in life now," he answered, "and that is, to improve the talents God has given me for the benefit of mankind. I am not conscious of any personal hope or ambition, but a strong sense of duty acts upon me, and will save me from the corrosion of disappointment and the listlessness of despair."
We then renew the whole, and find this will last twelve months or more, when it is renewed again. Meanwhile we have no pitting and no corrosion; but on the contrary, the interior surfaces appear to have taken a coating of oxide of zinc all over, and we have no trouble with them." Then the writer considered our present marine engine as to its efficiency and capability of further improvement.
=Sulphuric Acid=, or oil of vitriol, may be concentrated or diluted. It is frequently thrown over the person to disfigure the features or destroy the clothes. Parts of the body touched by it are stained, first white, and then dark brown or black. The presence of corrosion of the mouth is as important as the chemical tests.
The concretions found in the intestines and in the castings often have a worn appearance, but whether this is due to some amount of attrition or of chemical corrosion could not be told. Claparede believes that they are formed for the sake of acting as mill-stones, and of thus aiding in the trituration of the food.
The thin film of scale spread over the parts of a marine boiler situated beneath the water, effectually protect them from corrosion; and when the other parts are completely worn out the flues generally remain so perfect, that the hammer marks upon them are as conspicuous as at their first formation.
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