Correspondence calculation of high-voltage transmission lines

To the Editor: It was with great interest that I read the article on The Circle Diagram of a Transmission Network, by F. E. Terman, in the December, 1927 issue of your JOURNAL. In the year 1923, I made an extensive study regarding transmission phenomena. The investigation was utilized by the “Elektrizitatsaktiengesellschaft formerly W. Lahmeyer & Co.”, Frankfort-on-the-Main, Germany, for the purpose of planning and calculating the first German 220-kv. transmission (approximately 300 miles). In the meantime the line has been completed, parts of which are now provisionally operating at 110 kv.