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Q. What is the best mode of constructing the chimney and the parts in connection therewith? A. In sea-going steamers the funnel plates are usually about nine feet long and 3/16ths thick; and where different flues or boilers have their debouch in the same chimney, it is expedient to run division plates up the chimney for a considerable distance, to keep the draughts distinct.
These varieties of damper, however, have only yet been used in locomotive boilers, though applicable to tubular boilers of every description. Q. Is it a benefit to keep the flues or tubes appertaining to each furnace distinct?
Flues should be elevated a few inches above the floor, and supported by bricks, to allow all the radiating surface to act upon the atmosphere of the house, and should have, in order to secure sufficient draft, a gradual rise through their whole length from the furnace to the entrance into the chimney.
Q. Have you any remarks to offer respecting the construction and arrangement of the furnace bridges and dampers of marine boilers? A. The furnace bridges of marine boilers are walls or partitions built up at the ends of the furnaces to narrow the opening for the escape of heat into the flues.
It was of an odd size, and Agnes was not sure whether it would take half-an-hour or three-quarters to cook. Evelyn studied the white bird, felt the cold, clammy flesh, and inclined to forty minutes. Agnes thought that would be enough if she could get her oven hot enough. She began by raking out the flues, and Evelyn had to stand back to avoid the soot.
It is desirable to arrange the heating surface in such a way that the feed water entering the boiler at its lowest point is heated gradually as it ascends, until toward the superior part of the flues it is raised gradually into steam; but in all cases there will be currents in the boiler for which it is proper to provide.
As the squire was walking on the terrace Hopkins came up to him, and touching his hat, remarked that they should have frost in a day or two. "I suppose we shall," said the squire. "We must have the mason to the flues of that little grape-house, sir, before I can do any good with a fire there." "Which grape-house?" said the squire, crossly. "Why, the grape-house in the other garden, sir.
Seized with a panic, which, under the circumstances, was only natural, he rushed for the staircase, but found Washington Otis waiting for him there with the big garden-syringe; and being thus hemmed in by his enemies on every side, and driven almost to bay, he vanished into the great iron stove, which, fortunately for him, was not lit, and had to make his way home through the flues and chimneys, arriving at his own room in a terrible state of dirt, disorder, and despair.
A. If the boilers require to be scaled, the best method of performing the operation appears to be the following: Lay a train of shavings along the flues, open the safety valve to prevent the existence of any pressure within the boiler, and light the train of shavings, which, by expanding rapidly the metal of the flues, while the scale, from its imperfect conducting power, can only expand slowly, will crack off the scale; by washing down the flues with a hose, the scale will be carried to the bottom of the boiler, or issue, with the water, from the mud-hole doors.
It was she who saw that the furnace pipes were inspected, the chimney flues cleaned before winter; and who had the tomato frames properly laid away in the stable. Problems of drainage, of controversies with the neighbors, were instinctively brought to her, and she met and disposed of them with an unfailing vigorous good judgment.
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