Coil for Demountable Transformer, 70mm, 500 Turns, 0.5A Lab Supplies_Rulers & Measuring Supplies and commutator function from the

and commutator function from the inside out

8mm rod attachment and a centered 50mm aperture together hold a lens square against an optical-bench rail for repeatable refraction

Push-button engagement on a hand-cranked single-sided cone clutch

Metal spouting cylinder with multiple outlet holes at different heights

revealing cornea

Coil for Demountable Transformer, 70mm, 500 Turns, 0.5A Lab Supplies_Rulers & Measuring Supplies and commutator function from theFive hundred turn 0. 5A bobbin coil for the demountable transformer, panel mounted with 4mm sockets and an enclosed earth pin for safe wiring during induction and AC ratio demos.