Plano-Cylindrical Concave Lens, +17 Diopter, 50 x 50mm Category_Plasticware Tirrill burner on a stable

Tirrill burner on a stable octagonal base adds air

Hand-painted 4-part human brain model separates into cortical hemispheres and brain-stem regions for lobed-anatomy teaching at introductory biology levels

Funnel has a 19/26 size socket and includes an interchangeable plastic stopper

5-inch stainless steel rod cradle burettes

sized so that students can charge an outer pail and watch the inner pails register zero charge during the classic ice-pail demonstration

Plano-Cylindrical Concave Lens, +17 Diopter, 50 x 50mm Category_Plasticware Tirrill burner on a stablePlano cylindrical lens at 50 by 50mm with 17 diopter optical power and ground polished edges, the cylindrical curvature focusing light to a line rather than a point in optics demos.