From the July 5, 1930, issue
By Science News
POWER PLANT SENTINELS
When hundreds of thousands of horsepower traveling with the speed of lightning are instantly halted, you may be sure there will be a grand disturbance. And there is, but all the fuss is confined in steel tanks 25 feet tall and 10 feet wide, filled with oil.
Two such tanks are shown on the front cover of this week’s SCIENCE NEWS-LETTER. They are said to be the largest oil circuit breakers in the world, and the picture shows them being tested by the Westinghouse Electric and Manufacturing Co. They will soon be interrupting power on a 220,000-volt transmission line in New Jersey.