Plug-Type Brass Resistance Box, Model B Geology_Geology Charts & Models Three 1W resistors of different

Three 1W resistors of different values on a single base with six 4mm terminals

0 degrees Celsius

Nineteen-piece electrostatics kit anchored by a gold-leaf electroscope

25-inch frame with draining pins for post-wash inversion and drying

the f/3 curvature stretching the focal throw for demos that need the focal point set comfortably beyond the mirror face

Plug-Type Brass Resistance Box, Model B Geology_Geology Charts & Models Three 1W resistors of differentPlug type resistance box with constantan wire coils between split brass contact blocks, providing low temperature coefficient reference values for Ohm's law and bridge calibration work.