Tirrill Burner with Octagonal Base, Natural Gas Physics_Heat & Thermodynamics Plastic-bodied wave apparatus with eccentric

Plastic-bodied wave apparatus with eccentric discs that drive metal rods up and down as the handle turns

and S-wave vs P-wave behavior

supporting small-feature eye anatomy teaching

Hand-driven Newton's color disc that spins seven painted segments fast enough to merge into apparent white through persistence-of-vision and additive color mixing

Heavy-gauge steel inclined plane with built-in vertical

Tirrill Burner with Octagonal Base, Natural Gas Physics_Heat & Thermodynamics Plastic-bodied wave apparatus with eccentricTirrill burner on a stable octagonal base adds air, flame, and gas control on natural gas for high temperature chemistry heating applications.