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Summary
Figure 2 - Schematic electrical diagram from Bausch & Lomb Spectronic 20 Colorimeter Cat No. 33-29-40, Reference manual. Rochester, New York: Bausch & Lomb Incorporated, [1962], page 4. Figure caption reads: "FIGURE 2 - SCHEMATIC ELECTRICAL DIAGRAM".
Note: The date of 1962 is based on the last two digits of the code on the back cover, "332940-181ND, 600, II-62".
There is no copyright statement in the manual, and no copyright registration renewal for the manual. It is therefore in the public domain in the United States of America.
Tags
history of science
science
science history institute
schematic diagrams
spectronic 20
high resolution
ultra high resolution
diagram
architectural diagrams
Date
1962
Source
Science History Institute
Link
Copyright info
public domain