Circular Perspex Block for Refraction Science at Home_Earth Science and raised molded graduations

and raised molded graduations

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

Two pith balls suspended on unspun silk from a brass pillar

Use for investigation of gas at constant volume By inserting the glass bulb into either warm or cold water the expansion and contraction to the air contained in the bulb can be seen as a pressure change on the gauge

a 12V/21W lamp house

Circular Perspex Block for Refraction Science at Home_Earth Science and raised molded graduationsRound 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.