Electro-magnetic screening

Electro Magnetic Interference from Satellites aircraft etc. Screened enclosures. GHz. ... 

The method of recording the tunc of passage of flame along the tube was electrical. Each screen-wire carried a small electric current, the interruption of tills current when the flame melted the wires being recorded by the movement of an electro-magnet. 

Vibrating Screen. A screen, set at an angle of 25-35° to the horizontal, and vibrated by an eccentric, a cam or hammer, an out-of-balance pulley, or an electro-magnet. When operating with 10-mesh cloth on damp clay, such a screen should have an output of about 5 ton/ h/m2. The screening efficiency is generally 80-85%. 

The main categories of electrical/optical ceramics are as follows phosphors for TV, radar and oscilloscope screens voltage-dependent and thermally sensitive resistors dielectrics, including ferroelectrics piezoelectric materials, again including ferroelectrics pyroelectric ceramics electro-optic ceramics and magnetic ceramics. 

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