Humboldt State University ® Department of Chemistry
Robert A. Paselk Scientific Instrument Museum
The Chart below is printed on heavy cardstock on four panels which folds out first to show the two text pages, then all four chart simultaneously. It was issued by Bausch & Lomb at an uncertasin date, but probably in the 1920's. It is reproduced with permission from Bausch & Lomb Inc.
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