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Take a good Galloway or multitubular boiler; for 75 horse power effective the heating surface must be at least 74 square feet. Using good Cardiff coal, with 4 per cent. of ash, and a heating power of 15,660 Fahr. units; the steam raised will be 8 to 9 pounds per pound of coal, so that 9,400 to 10,577 Fahr. units are utilized in raising steam, or 68 to 76 per cent., which is an excellent result.
At noon the day before Grindelwald the thermometer could not have stood at less than 100 degrees Fahr. in the sun; and in the evening, judging from the icicles formed, and the state of the windows, there must have been at least twelve DINGBLATTER of frost, thus giving a change of 80 degrees during a few hours.
That snowfall tends to warm the air by setting free the heat which was engaged in keeping the water in a state of vapour is familiarly shown by the warming which attends an ordinary snowstorm. Even if the fall begin with a temperature of about 0° Fahr., the air is pretty sure to rise to near the freezing point.
The dry mixture is then transferred to a large glass tube, having a small hole in the bottom plugged with glass wool to act as a filter, and light petroleum spirit which boils at about 150 deg. to 180 deg. Fahr. is poured over it, till all the neutral or unsaponifiable oil is dissolved out.
Nicolosi, according to Signor Gemmellero, a Sicilian physician, long resident at Catania, is two thousand one hundred and twenty-eight feet above the level of the sea, and its mean temperature 64° Fahr.
It vaporizes at 185 degrees C. or 365 degrees Fahr., hence it is not driven off by continued boiling of tea infusion. W. Dittmar found by experiment that prolonged steeping of tea leaves up to ten minutes increased the proportion of theine in the infusion. His results are as follows: STEEPED 5 MINUTES. Average of 8 samples Chinese tea: Theine, per cent infusion 2.58 Tannin 3.06
Doubled, it shielded my eyes perfectly from the hot wind and sand. It serves also as an excellent protection for the eyes against the flies whilst I am writing. This is the second day of the hot wind. In the evening we heard crickets singing in the scorching sand. At mid-day the thermometer, when buried, rose to 122°° Fahr.
Was it not always believed until Fourier that the temperature of the interplanetary spaces decreased perpetually? and is it not known at the present time that the greatest cold of the ethereal regions is never lower than 40 degrees below zero Fahr.? Why should it not be the same with the internal heat?
The heat was increasing in a manner to cause us the most fearful anxiety, and certainly the temperature was at this moment at the height of 100° Fahr. What could be the meaning of such a change?
Our tents stood on ground high above the reach of flood. The soil was excellent, and the brushes behind us abounded with a new species of melaleuca. The heat of the weather, at this time, was extremely oppressive, and the thermometer was seldom under 100 degrees of Fahr. at noon.
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