Pair of glass plate, optically polished, 60 mm diameter, one plane the other plano convex, mounted together in metal frame. Pressure between plates adjustable by three brass nickel plated screws.
NEWTON COLOUR DISC
For demonstrating that white light may be composed from all the spectral colors by rotation of multi-colored disc. Comprising a multi-colored disc, 18mm diameter mounted on medal stand and driven by belt with help of driving wheel, fitted with a handle, individually packed
