Optically Worked Double Concave Glass Lens, 75mm Diameter, 300mm Focal Length, Alternate Model Item Type_Bone Cutter this plug-type resistance box lets

this plug-type resistance box lets students see the switching action of each decade

Top ground joint has a 29/32 size socket

a low-cost option for introductory mechanical-advantage demonstrations

Right-angle cone to flexible tubing Rotaflow stopcock in borosilicate glass connects ground joint apparatus to rubber tubing with flow control

supporting skeletal identification coursework with a key card

Optically Worked Double Concave Glass Lens, 75mm Diameter, 300mm Focal Length, Alternate Model Item Type_Bone Cutter this plug-type resistance box letsAlternate model 75mm double concave glass lens at 300mm focal length, parallel build to the main line 300mm focal model with ground polished edges for replacement or backup inventory.