OCR Text |
Show l.lal.l allies fowrr. Professor Hoppo reports In tht "Anhlv fur Post mid Telegraphic" s new example of the mechanical power of a lightning discharge. In a storm that raged at Klauiihnl, In tha Hartr niounlntne, a holt filtering a house alrurk a wooden post on whoae ton two metallic nails one-iliih of an Inch In diameter were melted. No forge rould have effected this; to bring It about, an electric current of 20 amperes Intensity Intens-ity and 20,000 volts tension must havs passed through the nulla. Supposing that the action of the lightning lasted a second, the dynumlu power thus developed de-veloped was equal to 5. "00 horse power, but If, as Is more probnblo, the discharge dis-charge lasted only one-tenth at a second, sec-ond, we get a rnte of work Hint does not full short of 60,000 horse power. |