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The former is a salt which appears under the form of white crystals; when heated to a temperature of 400° it is transformed into chlorine of potassium, and the oxygen which it contains is given off freely. Now 18 lbs. of chlorate of potash give 7 lbs of oxygen that is to say, the quantity necessary to the travellers for twenty-four hours.
The cattle of Mponda are like fatted Madagascar beasts, and the hump seems as if it would weigh 100 lbs. The size of body is so enormous that their legs, as remarked by our men, seemed very small. Mponda is a blustering sort of person, but immensely interested in everything European. He says that he would like to go with me. "Would not care though he were away ten years."
All the sledging stores had to be taken across, and Mackintosh proposed to place additional supplies there in case a party, returning late from the Barrier, had to spend winter months at Hut Point. The first party, consisting of Mackintosh, Richards, and Spencer- Smith, left Cape Evans on September 1 with 600 lbs. of stores on one sledge, and had an uneventful journey to Hut Point.
In locomotive boilers the strain of 4000 lbs. per square inch of section is sometimes exceeded by nearly one half; but such an excess of strain approaches the limits of danger. Q. Will you explain in what way the various strains subsisting in a steam engine may be resolved into tensile and crushing strains; also in what way the magnitude of those strains may be determined?
A. The quantity of fuel burned on each square foot of fire grate per hour, varies very much in different boilers; in wagon boilers it is from 10 to 13 lbs.; in Cornish boilers from 3-1/2 to 4 lbs.; and in locomotive boilers from 80 to 150 lbs.; but about 1 cwt. per hour is a good proportion in locomotives, as has been already explained.
Can get no definite information as to our route. M'Kenzie says we are all right; can make it of course. Gave away bag of flour. Discarded single blanket, 5 lbs. can lard. Got at Rigolette yesterday, 10 lbs. sugar, 5 lbs. dried apples, 4 1/2 lbs. tobacco. Bought here 5 lbs. sugar. M'Kenzie gave me an 8 lb. 3 in. gill net. Wednesday, July 15th. Wind light, southeast all day, light clouds.
There was also a Nieuport two-cylinder air-cooled horizontal engine, developing 35 horse-power when running at 1,300 revolutions per minute, and being built at a weight of 5.1 lbs. per horse-power. The cylinders were of 5.3 inches diameter by 5.9 inches stroke; the engine followed the lines of the Darracq and Dutheil-Chambers pretty closely, and thus calls for no special description.
First made semi-cooled the exhaust valve was left air-cooled, and then entirely water-jacketed this engine demonstrated the advantage of full water cooling, for under the latter condition the same power was developed with cylinders a quarter of an inch less in diameter than in the semi-cooled pattern; at the same time the weight was brought down to 4 1/2 lbs. per horsepower.
They may be wrought by steam, water, or wind, and they produce from 100 to 1,000 lbs. of ice per hour, according to size, at a cost of from 2d. to 5d. per 100 lbs., this difference resulting from the varying prices of fuel and the mode of working chosen. One of their uses is to cool rooms, cellars, theaters, hospitals, compartments of ships, etc. Builder.
Clips placed on this and on the rubber connection between tube and bottle will prevent the escape of mercury should the apparatus be upset when not in use. The average blowing pressure of which the lungs are capable is about 1-1/2 lbs. per square inch; inspiration pressure without mouth suction about 1 lb. per square inch; suction pressure 2-1/2 to 3 lbs. per square inch. Caution.
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