Hartley's Rotatable Optical Disc Material_Muslin a 125 by 65 by

a 125 by 65 by 18mm acrylic rectangular block with beveled edges widens the visible refraction shift in Snell's law setups

a step up from the 70mm model with extended pole separation that gives field-mapping experiments more room along the magnet axis

5 inches producing 50-60 dots per second via a vibrating striker

bundling Faraday's pail

9-piece organic chemistry and distillation glassware set provides comprehensive apparatus for laboratory synthesis and separation procedures

Hartley's Rotatable Optical Disc Material_Muslin a 125 by 65 by230mm disc graduated 0 360 degrees in 1 degree steps locks in any position alongside a rotatable lamp house and six magnetic acrylic elements for full ray tracing studies of reflection and refraction.