Eureka/Constantan Bare Wire, Model H Subcategory_Color and Light paired with the 750mm black

paired with the 750mm black lead to keep wiring color-coded across mid-distance bench setups

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

the optical glass producing undistorted views of specimens

Used to measure current by reading compass-needle deflection inside a coil

Eureka/Constantan Bare Wire, Model H Subcategory_Color and Light paired with the 750mm blackReel 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.