This is a generic Magnetic Compass used in aircraft. It includes a Compass Deviation Card. 磁罗盘 指南针 方向 磁罗盘
meant for a group logo of functional materials. it consists of a hysteresis loop in a gradient of colours. A magnet, a pn junction with holes and electrons, some wavy arrows showing field movement. an AFM tip on a topography. pe 循环 滞后 原子力显微镜探针 功能材料
red blue south north bar magnetic lab magnet laboratory physics magnets poles bar-magnet Bar Magnets clip art 磁铁 条形磁铁的剪贴画