Rare antique educational hand-crank DC dynamo demonstration apparatus used in physics classrooms, laboratories, and technical schools to demonstrate mechanical-to-electrical energy conversion. Turning the large hand crank drives an internal gear mechanism, spinning the armature inside the magnetic field to generate direct current and illuminate the attached incandescent bulb.This fascinating early electrical teaching device features a heavy cast-iron geared crank housing, open-frame dynamo assembly, exposed wound armature, copper commutator, brush assembly, cloth-wrapped field coil, and an integrated porcelain light socket with protective wire cage.Technical Details:* Type: Educational/Laboratory Hand-Crank DC Dynamo* Function: Mechanical energy converted to electrical output* Approx. Base Length: 12–12.5 inches* Approx. Height: 8.25–8.5 inches* Base: Layered wooden planking on solid wood block with fiber/cardboard liner* Hand-crank gear-driven generator mechanism* Open-frame armature and commutator assembly* Cloth-insulated field coil* Original demonstration light fixture with incandescent bulbCondition:Untested; sold as-is for repair, restoration, educational display, or parts. Mechanical movement, electrical output, wiring, bulb socket, and internal components have not been tested. Due to age, this item may require cleaning, lubrication, rewiring, or restoration before operation. Expect vintage wear including oxidation, surface rust, scratches, wood wear, discoloration, and age-related patina. Please review all photos carefully for condition and completeness.

See photos