Alnico Horseshoe Magnet, 50 x 12 x 15mm Material_Zinc Millimeter-graduated 15cm Hooke's-Law scale on

Millimeter-graduated 15cm Hooke's-Law scale on a 30cm support rod

fitted with two 4mm terminal posts

Ninety-five-piece molecular model set with 53 atoms and 42 links spanning organic and inorganic chemistry

configured to make and break a circuit at the rhythm of a Morse-code transmission for telegraph-history demonstrations

Six 10 x 10cm unmounted plastic filter squares - red

Alnico Horseshoe Magnet, 50 x 12 x 15mm Material_Zinc Millimeter-graduated 15cm Hooke's-Law scale onAluminum nickel cobalt alloy 50 x 12 x 15mm horseshoe magnet with included keeper bar, the Alnico composition resisting demagnetization for repeatable field mapping experiments.