Optically Worked Double Concave Glass Lens, 75mm Diameter, 500mm Focal Length Subcategory_Stirring Bars and Rods and standing waves visibly enough

and standing waves visibly enough to compare amplitude

Aluminum mounting pulley with a 2-inch (50mm) diameter wheel and a tapped hole sized for rods up to 13mm

its small thermal capacity letting most heat transfer go to the sample during calorimetry work

Aluminum-handled collecting net swings lightweight through tall grass and air sweeps for classroom field trips and introductory entomology sampling work

Optically Worked Double Concave Glass Lens, 75mm Diameter, 500mm Focal Length Subcategory_Stirring Bars and Rods and standing waves visibly enoughVery long focal 75mm double concave glass lens at 500mm focal length, the gentle diverging curvature yielding subtler virtual image reduction for nuanced refraction work.