Compressed air . ressure in the solar atmos])here, concludes that points on the sun wheretitanium is seen in the solar spectrum to bevolatilized must have a temperature betweentwo estimates of such heat already made—6,590degrees C. and 2,000 degrees to 3,000 degreesC. The probability is that the latter is nearerto the true bent of the sun the is verv much kjwer than earlv estimates. THR excavation of iron ore by electric andcompressed air shovels, instead of steamshovels, is to be with on range in Minnesota; an electric shovelfor this purpo
Compressed air . ressure in the solar atmos])here, concludes that points on the sun wheretitanium is seen in the solar spectrum to bevolatilized must have a temperature betweentwo estimates of such heat already made—6,590degrees C. and 2,000 degrees to 3,000 degreesC. The probability is that the latter is nearerto the true bent of the sun the is verv much kjwer than earlv estimates. THR excavation of iron ore by electric andcompressed air shovels, instead of steamshovels, is to be with on range in Minnesota; an electric shovelfor this purpose is now being built by theBucyrus Company. It is hoped to economizeby generating power at one large central plant,instead of by a boiler and engine on each ofthe numerous machines. The electric powerwill be generated at the new Duluth water-power plant. Experiments are also being madewith a cableway of about 1,000 feet span,handling grab buckets, the cableway travellingover the ore bed as the work feORRE-SPONDElVci^i
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectcompres, bookyear1896
