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Participants in the network at the time had a majority animist population.
The screen is usually instead made out of a special lead-free silicate glass formulation with barium and strontium to shield against x-rays.
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The temperature of the glass below the yoke is thus checked during the design of a new yoke.
It also required a lower voltage power supply for the final anode since it didn't use a shadow mask, which normally blocks around 80% of the electrons generated by the electron gun.