Mineral commerce and international relations

✍ Scribed by Edward Sampson

• Publisher: Elsevier Science
• Year: 1936
• Tongue: English
• Weight: 40 KB
• Volume: 221
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(36)91101-8

✦ Synopsis

I characteristic variation forms with more or less pronounced and superimposed periodic or quasiperiodic variation. The main problem was how to explain the generation of these variation forms from known discharges as they were observed at the most probable centres of emission e.g. lightning paths. For that purpose the transmission equation for radio waves was applied on such discharge variation forms which had been observed to be usual in partial lightning discharges. From the calculation it was concluded that atmospherics with typical variations could be derived from lightning discharges with known and uncomplicated variation forms fixed by cathode ray oscillographic recording. The sometimes apparently complicated variation forms of atmospherics of the short variation type were thus in the most cases found to be a secondary effect caused by gradual deformation during transmission.