Closed Retort Ring with Stem, 5.9" ID, Plated Mild Steel Material_Bristle Sprung-tip jockey contact slides smoothly

Sprung-tip jockey contact slides smoothly along the resistance wire of a Wheatstone bridge or potentiometer to find the null-deflection balance point during student-built bridge experiments

designed to receive real images projected by lenses and concave mirrors during focal-length and magnification experiments on the optical bench

closing to a stored length of 6

Long-format 150mm-length equilateral acrylic prism with 25mm faces

Closed Retort Ring with Stem, 5.9" ID, Plated Mild Steel Material_Bristle Sprung-tip jockey contact slides smoothlyPlated mild steel closed retort ring with a 5. 9 inch inner diameter and 5. 5 inch stem, sized for large flasks and funnels held over heat sources in chemistry setups.