Capacitance Substitution Box, Model 1138 Capacity_2000mL Designed to measure Planck's constant

Designed to measure Planck's constant through the photoelectric effect

Built to grip round flasks and condensers during distillation or reflux

Hand-painted 4-part human brain model separates into cortical hemispheres and brain-stem regions for lobed-anatomy teaching at introductory biology levels

Hand-driven Newton's color disc that spins seven painted segments fast enough to merge into apparent white through persistence-of-vision and additive color mixing

Capacitance Substitution Box, Model 1138 Capacity_2000mL Designed to measure Planck's constantTwelve position rotary capacitance substitution box selecting one capacitor at a time, providing a quick swap in reference for general purpose AC circuit and timing experiment work.