Optically Worked Double Concave Glass Lens, 75mm Diameter, 300mm Focal Length, Alternate Model Item Type_Bone Cutter Used to enclose dry cells

Used to enclose dry cells safely for student-built circuits

and instructions for general electronics diagnostics

Sized for standard student use

palisade and spongy mesophyll

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

Optically Worked Double Concave Glass Lens, 75mm Diameter, 300mm Focal Length, Alternate Model Item Type_Bone Cutter Used to enclose dry cellsAlternate 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.