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Commercial valence block models for use in the lecture hall based on a peg and hole locking mechanism and interchangeable cardboard labels.
Issue 56 describes an unusual type of chemical model known as a valence block that was once used to teach introductory chemistry and which also appeared in chemistry sets in the period 1940-1960.
Click here for all other issues of notes from the Oesper Collections and to explore the Jensen-Thomas Apparatus Collection.