![]() ![]() Spheres are presented in three formats: small open, for hydrogen large open, for carbon, and large filled (inverse video) for other atoms. ![]() Once the technique of shape generation has been mastered, the results are rewarding, for in addition t o the facilities for rotating the shape and changing its size, one can also view the shape with either the spheres (atoms) or lines (bonds) erased. Exemplary presentations of this method, and of the Cartesian technique, are presented in the tutorials. As noted, with a good set of molecular models, and with patient attention t o detail, many shapes could be generated and stored on disk hy means of the internal coordinate method. Because this is essentially a graphics utility product, adaptation to a particular curriculum or institution would be relatively easy in terms of generating the shapes needed for a particular application, assuming availability of the necessary data. The only instance of the program "hanging" in our experience was an attempt t o enter the coordinates for the 41th atom in a 48-atom structure. Drive access are trapped by an unconditional return to the Main Menu, and the Applesoft error number (which can be looked up in the appropriate Apple manual) is printed and labelled as such.
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