3/4" Steel Marbles, 5-Pack Subcategory_Magnetism Designed to measure Planck's constant

Designed to measure Planck's constant through the photoelectric effect

configured to make and break a circuit at the rhythm of a Morse-code transmission for telegraph-history demonstrations

Highly-detailed digestive canal model isolates the GI tract from surrounding organs to expose mucosal and muscular layers along the full length of the canal

6-inch diameter

3/4" Steel Marbles, 5-Pack Subcategory_Magnetism Designed to measure Planck's constantFive pack of 3 4 inch steel marbles, providing dense uniform spheres for ramp and collision experiments where a heavier projectile is needed than the plastic marbles can provide.