factor to the experimental f.i.d. spectrum in order to improve the signal-to-noise ratio in the transformed spectrum may be observed. The consequent loss of resolution is readily seen. Other values for the parameter S E may be used to give resolution enhancement. This seauence of units has been used effectivelv during .ectures i n J course ,,ti principle> and applicariona or Feuritr-transiurm UhlH trc,hniuuc. The students then use the program in their own time to obtain more experience of the way in which the variations in parameters affect the experimental spectra. A single-page list of instructions is provided
theinstruction sheet, are available from the author upon request. A check for $10, made payable to the University of Canterbury, should b- included.
Drawing of Ball and Stick Type Molecular Models with Hidden Line Elimination Hidehiko Nakano, Osamu Sangen, and Yoshitake Yamamoto Himeji institute of Technology Shosha, Himeji 671-22, Japan Some programs have been reported for drawing of molecular structures by microcomputers (1,4) but these programs do not eliminate hidden lines. therebv increasing the realitv of drawings. Preparation of a with lhidden line elimination according to the same algorithms as are utilized " with mainframe computers is difficult due to the limitation of memorv size and calculation soeed. We have develo~eda simplified algorithm for drawing ball-and-stick m o l e h a r structures with hidden line elimination, and oreoared a oro. . Cram adaptable r u low cost m i c n ~ c ~ m p ustw~ er m s . This vrunram. written in 11.2SI
