This was a fully automatic motorized rewind processor which allowed one to process up to 200ft of movie film from 16mm to 70mm in width. This is perhaps the method ensuring the most professional results. A 25ft length of vinyl or rubber hose was used that was just slightly larger in diameter than the gauge of the film. A stopper was used on either end, and these were referred to as 'snakes' by the 'beat' generation of the 50's. A bit clumsy to work with but can be quite effective.
Drawbacks are insufficient processing agitation, scratch and damage marks etc.
Various versions of these were made. I hope this helps you out some. Let me know if you require any technical details should you want to process any film.