Human Respiratory System Model, Half Life Size, with Head, Throat, and Lungs Ag Mechanics the triangular-cross-section blank giving classroom-grade

the triangular-cross-section blank giving classroom-grade dispersion for refraction and spectral-line experiments

3 inches wide with a 1-inch spout

75-inch plano-convex lenses in an aluminum frame

75 inches of plunger travel

dropping freely through the ring when cool but stopped by the ring once flame heating expands the ball

Human Respiratory System Model, Half Life Size, with Head, Throat, and Lungs Ag Mechanics the triangular-cross-section blank giving classroom-gradeLongitudinal head throat lung cross section reveals the full air pathway from nostrils through trachea to alveoli at half life size for respiratory teaching.