Optically Worked Double Concave Glass Lens, 75mm Diameter, 500mm Focal Length Subcategory_Stirring Bars and Rods Aluminum mounting pulley with a

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

Step-down transformer matched to a 35-watt sodium lamp on a 220V AC mains supply

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

Life-size stomach model shows gastric fundus

Six-pronged conductometer with 3

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