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The extreme high temperature of the interior division equals that of points lying a dozen degrees south in other longitudes, and the desiccated winds from the west, as they blow over this parched and heated surface, have their aridity rather than their humidity increased, as would be the case in other circumstances; and not till they reach within perhaps five hundred miles of the eastern boundary of this continental division do they increase in humidity, as indicated by the rain-fall, which rises in quantity from the low minimum of seven and a half cubic inches per annum in the "great basin," and fifteen on the "great plains," to about twenty in Dakota territory and twenty-five in Minnesota, the eastern limit of this continental climate.
Some of the physical characteristics of chilled iron, as well as the surprising locomotive properties of carbon present in heated iron, were noticed. Attention was called to some German data, published by Dr. Percy in 1864, concerning an iron which before melting weighed approximately 448¼ lb. per cubic foot, and contained approximately 4 per cent. of carbon 3¼ being graphitic and ¾ combined.
But the air is breathed by the inferior animals as well as by man. It is also rendered impure by combustion. If by both of these causes ten times as much air is consumed as by man, there is still left one cubic mile of uncontaminated atmospheric air to every human being dwelling upon the surface of the earth.
Larger and more powerful vessels of this type have been, and still are being, constructed, culminating, so far as is known, in the "L-5," which is stated to have a capacity of about 1,000,000 cubic feet, and to possess an average speed of 65 miles per hour.
"Our war," said an American surgeon to me the other day, "taught us that a large number of cubic inches of air is not enough for a sick man, but that the air must be perpetually renewed by ventilation." December 24th. The papers publish extracts from German newspapers which have been found in the pockets of the prisoners who were taken on Wednesday.
The quarries at Maestricht have undermined a space of sixteen miles by six, or more than two American townships, and the catacombs of Rome, in part, at least, originally quarries, have a lineal extent of five hundred and fifty miles. The catacombs of Paris required the excavation of 13,000,000 cubic yards of stone, or more than four times the volume of the great pyramid.
Two hundred cubic centimeters of this filtrate require 29.62 cc. of 0.1062 N hydrochloric acid for neutralization, using phenolphthalein as an indicator. Calculate percentage of NaOH, Na CO , and H O. !Answers!: 78.63% NaOH; 4.45% Na CO ; 16.92% H O.
There is no difficulty in constructing regenerators of refractory bricks of sufficient capacity, however large the generators be; and a single apparatus might, if need be, convert one thousand tons of anthracite per day into more than five million cubic feet of gas. By WILLIAM SUGG, of London.
The following were the data for a day of 24 hours, with an interval of half an hour: 8:55 P.M. one day to 8:55 P.M. the next, interval 8:30 to 9 A.M. Anthracite used, 18.4 cwt.; coke used, 3.42 cwt.; water used for steam injection, 217.3 gallons; water used in scrubber, 4,106 gallons; water used in cooling the cylinder, 20,000 gallons; oil used in cylinder, 14.84 pounds; grease, 1.8 pounds; revolutions of machine, 142,157, or 100.8 per minute; effective work, 75.86 French horse power, or 77.4 British; gas used, 6,742 cubic feet per hour, at 772 mm. pressure and 70.7° F., or 83.7 cubic feet per effective horse power; efficiency, 69 per cent.
Now, if we say that coke contains in round numbers 90 per cent. carbon, then we will have 62.97 lb. of coke, equal in heat units to 1,000 cubic feet of natural gas. Then, if a ton of coke, or 2,000 lb., cost 10s., 62.97 lb. will cost 4d., or 1,000 cubic feet of gas is worth 4d. for its heating power.
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