Human Respiratory System Model, Half Life Size, with Head, Throat, and Lungs Ag Mechanics and ungraduated design for liquid

and ungraduated design for liquid addition

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

this clear dial provides a readable face for measuring angular displacement in physics setups

Demonstrates relative planetary motion on a 13-inch three-dimensional solar system model with a 5

75-inch plano-convex lenses in an aluminum frame

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