Single-Phase Rheostat, 300 x 56mm Meters_Electrical covering core dispersion and refraction

covering core dispersion and refraction shapes for ray-box optics work

this 28 SWG bare constantan wire on a 125g reel holds resistance stable as the surrounding circuit heats up

used to map the circular field around a current-carrying wire and confirm the right-hand rule

Wood-baseboard sonometer 98 x 9cm on four feet

Mid-decade capacitance box stepping 1nF to 10nF in 1nF increments at plus-or-minus 5% on 63V

Single-Phase Rheostat, 300 x 56mm Meters_Electrical covering core dispersion and refractionThree hundred thirty ohm 0. 95A single phase rheostat on a 300x56mm tube with cover protected constantan winding and 4mm safety socket terminals, at plus or minus 10% nominal value tolerance.