Extended-Range Rheostat, 200 x 44mm, Model D Subcategory_Inorganic Compounds Compact-turn 28 SWG bare copper

Compact-turn 28 SWG bare copper wire on a 250g reel approximating 800 feet

Rotation-to-linear gear-rack simple-machine model converting circular gear motion into straight-line rack travel

Steel keepers across the 50 x 12 x 8mm Alnico bar pair preserve field strength in storage between lessons

Larger 125-millimeter slotted screwdriver with a 4mm tip and durable plastic handle

Extended-Range Rheostat, 200 x 44mm, Model D Subcategory_Inorganic Compounds Compact-turn 28 SWG bare copperExtended range rheostat at 12 ohms and 4A on a 200x44mm tube with constantan winding, the moderate resistance moderate current option in the compact tube rheostat line.