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G.T. Hemmeter, chief of the mechanical engineering section of the engineering and development division, sets one of the automatic recording thermometers used on tunnel dryer which he designed for dehydrating vegetables. Regional agricultural research laboratory, Albany, California

G.T. Hemmeter, chief of the mechanical engineering section of the engi...

Public domain photograph of laboratory, science, research, free to use, no copyright restrictions image - Picryl description

[Washington, D.C. public schools, 1st Division - class studying thermometers]

[Washington, D.C. public schools, 1st Division - class studying thermo...

Title and other information transcribed from caption card. Frances Benjamin Johnston Collection (Library of Congress). In album: "1st Division." Caption card tracings: Schools Classes; Shelf.

G.T. Hemmeter, chief of the mechanical engineering section of the engineering and development division, sets one of the automatic recording thermometers used on tunnel dryer which he designed for dehydrating vegetables. Regional agricultural research laboratory, Albany, California

G.T. Hemmeter, chief of the mechanical engineering section of the engi...

Public domain photograph of laboratory, science, research, free to use, no copyright restrictions image - Picryl description