Description

Wooden-frame abacus with three U-shaped steel wires carrying 20 plastic beads each on a 13 by 6 inch base

and phase-change experiments

25-inch base raises a magnetic needle to a 4

and electromagnet leads

producing the nearly uniform field used to calibrate magnetic sensors and verify the Helmholtz geometry

Reading Magnifier, 50mm, 12cm Focal Length Capacity_125mL Wooden-frame abacus with three U-shapedChrome plated metal framed 50mm reading magnifier with a 12cm focal length, sized for fine print reading and convex lens image formation work in introductory optics.

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Reading Magnifier, 50mm, 12cm Focal Length Capacity_125mL Wooden-frame abacus with three U-shaped

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