is not in place then it will make a simple beep or other notification so that the operator can move it into proper position in step 1004 if the e t is in proper position it will raise and lower according to the operator 39 s commands in step 1005 if this station requires the operator climb to the needed level the optional e t steps will be put into place and attached to the optional step attachment 130 in step 1006 the steps are an optional feature of the invention and other climbing apparatus may be available to the operator such as an automatic platform with a safety gate which is part of the e t in step 1007 the operator determines if the first cylinder in the drum is in the correct position and if it is not then in step 1008 the operator rotates the drum to the correct position for the first wafer boat as can be appreciated by those skilled in the art a manual rotation device would provide the most economical design of the invention but other embodiments may be implemented which would require an electrical or even computer controlled rotation of the drum in order to minimize the possibility of operator error in step 1010 the operator loads the first series of wafer boats in the first cylinder contained in the drum generally speaking the invention will allow.