Portable recorders  , ...Trying to replace the bulky cast iron recording laythe  must have appeared  an inposible goal until this Byer recording deck was released. The Sound Recording Institute of Australia had castings made for thrir members to complete copys                of a  very inpressive laythe, driving the grouve cutting to exact placing of the 78 standard, or the much finer pitch of the newly  emerging   microgruve, just about to appear at Brashes Music drpartment.  The cutting head was equiped with a heated diamond tipped stylus         which cut into the shiny new acetate blank so carefuly coating  its aluminium former creating a shiny mirror finish.  Thrse blanks were waiting to carry  the  sound grouves.  The sound grouves movrd lateraly  in response to the level of the sound volume.  Grouve crashing challenged  users,  even for the wider spacr grouves of 78 recording .And now yhese new microgruves with their much tighter grouvespacing demanded  all the scills of the Sound  Recording Enginee r. 

Now wijh all  these dificu.ltys how could you belieive microgrouve recordjngs could be made  on a portable machine thr size of a hat box?