Eureka/Constantan Bare Wire, Model H Subcategory_Color and Light each fitted with 98 iron-rod

each fitted with 98 iron-rod plotting compasses in a 14 x 7 matrix that align with field lines whenever a magnet is brought near

charging battery with motor-generator #1

Eye model seated in a bony orbit socket illustrates the protective skull relationship of the eye alongside its internal anatomy in a combined teaching unit

Lead-free solder wire on a 100-gram spool

Eureka/Constantan Bare Wire, Model H Subcategory_Color and Light each fitted with 98 iron-rodReel of fine gauge 30 SWG bare constantan wire at 0. 31mm and 125g, sized for compact precision resistor windings and thermocouple junctions in student built apparatus.