Bryan Valence Blocks

Bryan Valence Blocks

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Arthur Herbert Bryan, a science department teacher at Baltimore City College, designed these Valence Blocks for use in chemistry classes. This set was made by the Porter Chemical Co. of Hagerstown, Md.
Ref: Arthur Herbert Bryan, “Valence Block for Illustrating Chemical Reactions,” U.S. Patent 2,140,103 (Dec. 13, 1938).
Arthur H. Bryan, “Valence Blocks Visualize High School Chemistry Fundamentals,” School Science and Mathematics (Nov. 1940): 758-760.
Currently not on view
Object Name
Molecular Model Kit
Porter Chemical Company
place made
United States: Maryland, Hagerstown
Associated Place
United States: New Jersey
overall: 3 in x 8 1/2 in x 5 1/2 in; 7.62 cm x 21.59 cm x 13.97 cm
overall: 3 1/8 in x 8 1/2 in x 5 1/2 in; 7.9375 cm x 21.59 cm x 13.97 cm
ID Number
accession number
catalog number
See more items in
Medicine and Science: Chemistry
Data Source
National Museum of American History
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