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When they apply the brake to a train, the train comes to a stop; but what becomes of the motion which it had previously possessed? It is transformed into heat, and the brake becomes hot. Why do they grease the axles of the wheels? To prevent their heating, because this heat would be generated by the motion which is thus lost by transformation." "Yes, I understand," replied Michel, "perfectly.
When done have ready in a saucepan a cup of cream, diluted with a few spoonfuls of hot water, for fear it might clot in heating, in which have been stirred cautiously two tablespoonfuls of melted butter, a scant tablespoonful of flour, and a little chopped parsley.
"It is so interesting," they said, "to get the exact time, every day, from the Eiffel Tower!" They had also some amazingly inexpensive contrivances for heating houses, or regulating the heating already installed, or for home refrigeration things which took them into cellars in Nancy and before they left to join their regiments they were exceedingly busy demonstrating those things.
Never cover it up, as that will cause it to turn sour very quickly. Before heating a second time, remove all the fat from the top. If this be melted in, the flavor of the soup will certainly be spoiled. Thickened soups require nearly double the seasoning used for thin soups or broth.
And unless something really practical is perfected, it is far wiser to rely upon the system of heating by convection through the air the principle, generally adopted, of continuously passing large quantities of freshly-heated air through the sudatory chambers; exposing, however, the heating apparatus, so that a maximum of radiant heat may be obtained; and carefully guarding against injuring the air whilst raising its temperature.
Regina and a girl friend had managed to furnish a two-room tenement apartment with very simple conveniences, and there they kept house. Rent was $10.50 a month; gas for heating and cooking, $1.80; and food for the two, about $5 a week. As Regina did her own washing, the weekly expense for each was but $3.67, less than many lodgers pay for very much less comfort.
Nevertheless I have bought one, and am wearing it at this very moment. But not as the poorer Arabs do. Beneath it there is a suit of ordinary winter clothing, as well as two English ulsters and this indoors. Perhaps this will give some idea of the cold of Gafsa. There is no heating these bare rooms with their icy walls and floorings: out of doors a blizzard is raging that would flay a rhinoceros.
If this is properly done, the heated piece of tube will become a short bulb of about double its original diameter, and about the same wall thickness as the original tube. The tube is now reheated as before, taking care this time that the heating extends over all that part of the bulb to the right of the dotted line in the figure, as well as part of the main tube adjoining.
If it is desired to utilize to the utmost the force stored up in the compressed air it is necessary to endeavor to supply heat to the air during expansion so as to keep its temperature constant. It would be possible to attain this object by the same means which prevent heating from compression, namely, by the circulation and injection of water.
When the power piston has reached the middle of its downward stroke, the displacer is at its lowest position, but is halfway up again when the power piston is quite down. The air is once again displaced downwards, and the cycle begins anew. The motive power is, therefore, provided by the alternate heating and cooling of the same air. Construction.
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