Double Convex Acrylic Lens, 89mm, 20cm Focal Length, Clear and Frosted Subject_Zoology Twenty-centimeter steel helical spring paired

Twenty-centimeter steel helical spring paired with 2kg

Compact mini DC motor on a molded ABS base

Produces steam for thermal-expansion and phase-change experiments through a thick-wall 1L aluminum can on a cast tripod base with a spring handle and size-13 stoppers

Compact regulated +15V DC power pack rated at 1 A

Studies oblique collisions between steel balls on a flat surface

Double Convex Acrylic Lens, 89mm, 20cm Focal Length, Clear and Frosted Subject_Zoology Twenty-centimeter steel helical spring pairedAcrylic double convex lens at 89mm with one clear face and one frosted, 20cm focal length, the frosted side acting as a screen for projected real image observation.