Double Convex round Lens, Material: Glass, designed for physics and educational uses, Because of their educational use design, there may be minor imperfections that do not affect physical function, for educational uses, Size: 200mm focal length, 2in diameter and 5.5mm thick
Pascalft s Law Apparatus, Weight: 3.3lb, Length: 13.0in, Width: 8.7in, Height: 9.4in, Consists of a moulded plastic base into top of which may be screwed one of a set of four vases of differing shape & a movable index on vertical rod enables the height of water