Mounted Magnetometer Subject_Botany 5-cm closed ring on this

5-cm closed ring on this plated mild steel retort accessory

and a wrist-pin string across a 720mm bridge span on a 1290 x 130 x 110mm hollow wooden sounding box

Vertical section of a monocot leaf enlarged 300x exposes parallel venation

Pair of Alnico bar magnets supplied with steel keepers in a cardboard box

this Alnico U-shape carries 45mm pole spacing for compact-bench field demonstrations and motor-effect setups

Mounted Magnetometer Subject_Botany 5-cm closed ring on thisPolished non warping wooden base with a built in meter scale carries a compass box magnetometer, sized for measuring direction and field strength on the lab bench.