Iris Diaphragm with Adjustable Aperture, 3" Outer, 30mm Max Manufacturer_Austerlitz Open back reveals spine and

Open back reveals spine and posterior musculature while the head section preserves upper-body context

exposing the longitudinal and transverse components of wave motion mechanically

Base-mounted 2-stroke diesel engine model in aluminum and plastic

and mechanical-advantage experiments (stand base and support clamp sold separately)

Iris Diaphragm with Adjustable Aperture, 3" Outer, 30mm Max Manufacturer_Austerlitz Open back reveals spine andAdjustable iris from closed to a 30mm maximum aperture inside a 3 inch black metal body, with a 2. 5 inch mounting rod giving 5 inches total length for standard optical bench setups.