US$ 86.62
Wooden-frame abacus with three U-shaped steel wires carrying 20 plastic beads each on a 13 by 6 inch base
SWG AWG Diameter (Inches) 18 16/17 0
Used to demonstrate rotational-to-linear motion conversion
and 2 quadruple pulleys on a heavy composite base with capstan
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.
US$ 86.62
US$ 65.93
US$ 150.56
US$ 52.03
US$ 148.30
US$ 153.27
US$ 132.25
US$ 41.06