Orthogqnal Projections of Stereomodel Molecules by Photography

Abstract

This paper describes a photographic method of obtaining inexpensive, accurately scaled reproductions of stereomodel molecules. An orthogonal projection is built up by transferring to tracing paper the centres of atoms reproduced on photographic enlargements of a skeleton molecular model. The photographic system is selected so that the lens focal length and distance between lens and model are such that parallax errors are less than the intrinsic dimensional errors in the original model. The anti-vibration precautions method of focusing the optical system and type of film selected together with details of the processing and enlarging systems ore also given.