Lightning and lightning protections . t to east, developestherein an inductive electro motiveforce, the direction of which is fromthe equator to the pole. If thearea were in contact with the grobeby sliding contacts at N and E, andthe circuit closed, the inductionwould produce a continuous the supposed conducting arc isFig. I. insulated, there would be an accumu- lation of positive electricity at the pole and of negative electricity at the equator. To this accumulation might be ascribed thepolar auroras on the one hand, and on the other hand the dailythunder storm in the equatorial
Lightning and lightning protections . t to east, developestherein an inductive electro motiveforce, the direction of which is fromthe equator to the pole. If thearea were in contact with the grobeby sliding contacts at N and E, andthe circuit closed, the inductionwould produce a continuous the supposed conducting arc isFig. I. insulated, there would be an accumu- lation of positive electricity at the pole and of negative electricity at the equator. To this accumulation might be ascribed thepolar auroras on the one hand, and on the other hand the dailythunder storm in the equatorial region. In 19uu Mr. put forward a theory to accountfor the siectrical phenomena connected with thunder storms. Thiswas b«.ead on his well known experiments on the condensation ofwater vapour from supersaturated air upon negative ions. It hasobtained considerable acceptance among prominent scientiststhroughout the world. But it has been disproved by George (Phil, kag., April, 19u9. ) It is so interesting to note. 5 that Mr. Simpsons argument f«r the dis—pruvement on Wilsonstheory that I will quate it here. Let the upward velocity of tn© air = Vcm#/Sec. Then the velocity of air which crosses the sq. cm. underconsideration in one second = V~ « The time taken for a given small velocity of air to passfrom the cloud to the condensation layer, 25,uu0 meter above =&.5xlu5 sec. V The number of ions of each sign generated in a in thistime 25x^.5*10° *106 V V The total number of negative ions which are retained at eadj3q. cm. of the condensation layer each second *10 V -V = *106. Now the charge on 3 10^ ions is equal to 1 electro-staticunit of electricity. Hence the maximum rate at which the charge would grow onthe condensation layer = 2*10~3 unit per sq. cm. per sec 3 lu6 We will now consider how long it will take for electricityaccumulating at such a rate at certain layer in the atmosphere togive rise to a lightning discharge. We h
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectlightning, bookyear19
