Optically Worked Double Convex Glass Lens, 75mm Diameter, 1000mm Focal Length Material_Brass Used to add variable resistance

Used to add variable resistance while keeping the slide-wire wiper enclosed

the workhorse decade for introductory Wheatstone-bridge and Ohm's-law work

the silvery-blue transition metal used as a hydrocarbon-processing catalyst and in metallurgy student demonstrations

with 4mm socket termination for direct connection to a standard laboratory low-voltage supply

Optically Worked Double Convex Glass Lens, 75mm Diameter, 1000mm Focal Length Material_Brass Used to add variable resistanceDesigned for parallel beam refraction work, this 75mm double convex glass lens at 1000mm focal length runs at f 13, near collimated for astronomical analogue and long throw projection setups.