Salt Lake Tribune | 1910-01-29 | Page 4 | Scientific Interest in Paulhan's Flight

IJ j .SCIENTIFIC INTEREST IN PAULHAN'S FLIGHT X At the moment Louis Paulhan rises '-'J 'from the ground in Salt Lake valley he , ,is at practically the samo height above ' the level of flic sea that he attained .,1 in his record -breaking ascent at Los j 'lis Anucles. M Tlio altitude of Salt Lako is 4366 !,l-g feet. The density of the air and, con- r i . ,;' sufuently, its sustaining power, is 14 V ), ' .M per cent less than at sea level. The ' '( ' presfiiiro at sea level, measured by the , i ( resistance of mercury, is 30 inches; the , i 71 pressure at Salt Lake, 25:63 inches. V i ' The density of the water of Great ,f :: ,.fJ Salt Lake, wits its 20 per cent of solids, ii ! ' compared with distilled wator. is as i .;? 117 to 100. The air of SalfLake is , 7 aH nlch thinner than the air of-Lob 'j j Angeles as distilled water is thinner i, S)M than the water of the lako. Tho d'ifFor- . ,f-' enco in sustaining power is about the j same as tho difference between naphtha or methyl alcohol and distilled wator, i if, a the water representing tho sea level I , air pressure. i tW In ballooning this difference cau be 1 i 'M partially overcome by a larger allow- . f ance for the expansion of gas and ro- , ii!,x duction in weight, but the heavicr- t "'K than-air machines, in which weight is a t I; subordinate factor, must overcome the i ' ijj lessenod sustaining force hy increased 5 speed, as a skater increases his speed , jj in crossing thin ice. ! 1 1 The slowest speed at which Hamilton t found it possible to remain in air at I ,j ",;. ! I-'0-'' AngeloH was at the fate of 1.61 'M rH'. t miles in 3:36 2-iJ. Theoretically tho .- '' minimum speed whore tho density of I- the atmosphere is 14.5 per cent lees t ' .i'hll would be 14.5 per cent fnstcr, or 1.61 t' U miles in 3:04. This and other theories , ! JM remain to be tested at high altitudes.