Variable Gap Magnet for Physics Demonstrations Base Size_8 x 5" Used to read spectral lines

Used to read spectral lines against a 400-700nm graduated scale

this resistance box at plus-or-minus 1% on each step replaces dozens of fixed resistors at the bench

producing distinct audible pitches at varying spin speeds to relate rotational frequency to perceived sound frequency

paired with 4mm sockets so iron-filing patterns can be mapped around a current-carrying conductor for Oersted's experiment

Sized for compact classroom display

Variable Gap Magnet for Physics Demonstrations Base Size_8 x 5" Used to read spectral linesAdjustment screws (3 x 1 inch) on a metal base position two neodymium magnets, varying the pole gap from 0. 4 to 8. 5cm and field strength from 100 to 7500 Gauss across the working volume.