Gold Leaf Electroscope Subject_Biology each fitted with 98 iron-rod

each fitted with 98 iron-rod plotting compasses in a 14 x 7 matrix that align with field lines whenever a magnet is brought near

and pins outfit groups for hands-on study of pinhole imaging

suspending thermometers above hot plates or fixing specimens in orientation

holding volume constant across specimens for isolated density comparisons

Eight-piece stainless steel slotted mass set supplied with a corrosion-resistant finish

Gold Leaf Electroscope Subject_Biology each fitted with 98 iron-rodSliding window gold leaf electroscope with anodized aluminum walls and an internal scale, registering induced or conducted charge through the Coulomb driven deflection of a single suspended leaf.