Use special calcium lead tin alloy plate grid, more resistant to corrosion, charging accept ability is better.
使用特殊的钙铅锡合金板栅，更耐腐蚀，充电接受能力更好。
2
The magnetic field distribution produced by displacement current in charging circular parallel plate condenser is discussed by using the concept of magnetic potential.
应用磁场矢势的概念讨论了充电圆形平行板电容器中的位移电流所产生的磁场分布。
3
A parallel plate condenser with installation of drying air, lighting and charging is provided, which can keep charge numbers constant in demonstration experiment.