The instruments were in operation 24/7/365 between 1955 and 1992 and tested daily by wholetime ROC officers and regularly reacted to the EMP from lightning strikes during thunderstorms.
The instruments were in operation 24/7/365 between 1955 and 1992 and tested daily by wholetime ROC officers. AWDREY regularly reacted to the EMP from lightning strikes during thunderstorms.