Tangent Galvanometer for Magnetic Field Measurement Subcategory_Botany Models and pyloric regions with internal

and pyloric regions with internal rugae

or batteries required

Lead-free five-cylinder equal-mass set at 30g each in zinc

Larger 100 x 12 x 15mm Alnico horseshoe steps the pole-gap geometry up from the 75mm model

Four 153 x 76mm plates - each holding 98 iron-rod plotting compasses in a 14 x 7 matrix - assemble flat or as the faces of a cube to display 2D and 3D field-line patterns

Tangent Galvanometer for Magnetic Field Measurement Subcategory_Botany Models and pyloric regions with internalTangent galvanometer instrument that derives current absolutely from compass needle deflection against Earth's horizontal field, the basis for classic determinations of the local BH constant.