Polyfotos were taken in special photo booths, which were often in large town centre department stores in the UK.  A set of 48 small sized portraits, usually head and shoulders, were taken automatically in rapid succession and a proof sheet produced.  Enlargements could be ordered (eg JS-s047).  See moving and creative use of Polyfotos by Daniel Meadows: https://vimeo.com/113843220.  Further information, for example, at http://www.polyfoto.co.uk/ and http://www.photodetective.co.uk/Polyfoto.html.