triggers a stationery magnetic switch 50 mounted on the side of insulated auger trough 24 timing between switch activation and cryogenic fluid spray initiation can be varied or turned off entirely depending upon feedstock requirements it is emphasized that transported feedstock 6 is also subjected to cryogenic fluid contact from spray head assemblies 700 by means of directional nozzles 41 as it traverses along the bottom of the insulated trough shaped chamber 24 the directional nozzles 41 also serve to maintain set operational temperature to better explain the expansion features of chamber 100 it is again emphasized that a typical cryogenic freezing chamber assembly 100 will contract about 1 inch when exposed to cryogenic temperature which approximates u2212 346 u00b0 f to compensate for this contraction and thus reduce undue stress on connecting equipment flexible bellows are used at the inlets and outlets of feedstock flow to further mitigate temperature induced stress chamber assembly 100 includes a fixed mounting at its center so that maximum thermal contraction is approximately u00bd inch at each end because of differential temperatures insulated auger trough 64 and auger drive shaft 7 expansions and contractions are not equal and must be compensated thus the front end of auger drive shaft 7 is free to float with thermal expansions within the front end bearing assembly 600 this is illustrated by gap g that is rotating shaft 28 can move due.