Iris Diaphragm with Adjustable Aperture, 3" Outer, 30mm Max Manufacturer_Austerlitz Base-mounted 2-stroke diesel engine model

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

leaving inertia to drop the ball straight into the waiting receptacle below

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

this double-convex converging lens gathers parallel light to a single focal point for bright image-formation demonstrations

Color-coded blue and red plastic cases on this bar-magnet pair (3 x 0

Iris Diaphragm with Adjustable Aperture, 3" Outer, 30mm Max Manufacturer_Austerlitz Base-mounted 2-stroke diesel engine modelAdjustable 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.