Optically Worked Double Convex Glass Lens, 75mm Diameter, 1000mm Focal Length Material_Brass with 4mm socket termination for

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

and aluminum at a shared 0

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

Plastic-bodied wave apparatus with eccentric discs that drive metal rods up and down as the handle turns

Chrome-plated 60mm reading magnifier extending to a 20cm focal length

Optically Worked Double Convex Glass Lens, 75mm Diameter, 1000mm Focal Length Material_Brass with 4mm socket termination forDesigned 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.