Home cine film projectors only became available from 1922. This projector, once fitted with a special filter, was able to project colour films using the system known as Kodacolor.
Kodacolor was an early colour film processing and projection system used from 1928 to 1935. It used black and white film sensitive to red, green and blue light and focused the light to lenticular bands embossed on the emulsion.
When filming, a red, green and blue striped filter was placed over the camera lens to focus the light on these embossed bands.
The filter is also fitted to the lens of the projector which will recover the light captured in the embossed bands to reveal the full colour image.
An example of the Kodacolor process can be seen in the film 'Where the Bens Stand Sentinel'.