Tangent Galvanometer for Magnetic Field Measurement Subcategory_Botany Models Seventy-times enlarged skin cross section

Seventy-times enlarged skin cross section reveals epidermis

Supplied as the seven most common classroom sizes

25 x 2 x 1 inches with a sliding top

or batteries required

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 Seventy-times enlarged skin cross sectionTangent 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.