a detector consisting of a fine wire in contact with a galena crystal; acts as a rectifier

a detector consisting of a fine wire in contact with a galena crystal; acts as a rectifier

a detector consisting of a fine wire in contact with a galena crystal; acts as a rectifier

a detector consisting of a fine wire in contact with a galena crystal; acts as a rectifier

a detector consisting of a fine wire in contact with a galena crystal; acts as a rectifier

One that detects, especially a mechanical, electrical, or chemical device that automatically identifies and records or registers a stimulus, such as an environmental change in pressure or temperature, an electric signal, or radiation from a radioactive material, electronic equipment that detects the presence of radio signals or radioactivity, An indicator showing the depth of the water in a boiler