每个螺线管回路的一半都换成了铝卡，其中嵌入了细小的维卡合金棒形磁铁。
One-half of each solenoid loop was replaced with an aluminum card into which tiny vicalloy bar magnets were embedded.
电磁铁或螺线管包括只不过是绝缘电线线轴上的伤口的数量更多，提供一个合适的基地，连接线和插头。
The electromagnet or solenoid consists of nothing more than a quantity of insulated wire wound on a spool, and provided with a suitable base, connecting wire and plug.
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