Lead-Acid Accumulator, 2V, Alternate Model Pack Size_15 Aluminum-cased plotting compass with a

Aluminum-cased plotting compass with a glass face and a dial marked with principal points

supplied with keepers in a cardboard storage box for routine classroom work on field lines

and vacuolar differences

Pink-dotted ends and steel keepers across this 50 x 12mm Alnico cylinder pair simplify pole identification while the keepers preserve field strength during cardboard-box storage

Lead-Acid Accumulator, 2V, Alternate Model Pack Size_15 Aluminum-cased plotting compass with aMultiplate 2V 45Ah lead acid accumulator built for heavy current draw, sized to power electrolysis, electroplating, and continuous DC demonstrations beyond the reach of dry cell stacks.