Optically Worked Double Concave Glass Lens, 75mm Diameter, 150mm Focal Length Category_Science Gifts Natural gas Tirrill Bunsen burner

Natural gas Tirrill Bunsen burner pairing a gas flow valve with air flow adjustment for finer flame control

providing the cleanest hand-operated way to make and break a circuit during early electricity instruction with stackable modules

This round convex glass mirror is designed for physics and educational uses

9A with oxidized constantan winding on a vitreous-enameled steel tube and a phosphor-bronze sliding contact

supporting 18 mm thermometers upright and protected between laboratory uses

Optically Worked Double Concave Glass Lens, 75mm Diameter, 150mm Focal Length Category_Science Gifts Natural gas Tirrill Bunsen burnerOptically worked double concave glass lens at 75mm diameter and 150mm focal length, the diverging curvature producing virtual upright images for refraction and beam spreading work.