Circular Perspex Block for Refraction Science at Home_Earth Science Three-wheel stacked metal pulley for

Three-wheel stacked metal pulley for maximum mechanical advantage in compound pulley systems

a 12V/21W lamp house

and small diffraction objects in the optical-bench beam path for repeatable interference and diffraction work

Two pith balls suspended on unspun silk from a brass pillar

sized to fit the PH0380A bar-breaking apparatus for repeated thermal-contraction fracture demonstrations

Circular Perspex Block for Refraction Science at Home_Earth Science Three-wheel stacked metal pulley forRound perspex refraction block, the curved face geometry letting beams enter along any radius for clean Snell's law angle work in ray box and refraction setups.