Spare Charged Porous Pot Category_Anatomy and Life Science and ring magnets with plotting

and ring magnets with plotting compasses

Hand-cranked worm-and-wheel drive with a rotation dial between clear acrylic plates

Used to measure induced EMF as a magnet falls through a 100-turn coil on a 15mm acrylic tube

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

Spare Charged Porous Pot Category_Anatomy and Life Science and ring magnets with plottingSpare charged porous pot for the Leclanche cell, supplying a 1. 5V replacement element so wet cell demonstrations stay running once the original electrolyte loses charge capacity.