File:Johnson Controls Temperature Control System.jpg
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Summary
Patent drawing of the "Heat Regulating Apparatus" of Walter Johnson--a system of components that provided automatic temperature controls for multi-room buildings. Patented 1895, US no. 542,733. Johnson's system was widely employed, using pneumatic controls to regulate room temperatures.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 21:00, 6 October 2022 | | 4,595 × 6,921 (2.5 MB) | ThomFehring (talk | contribs) | Patent drawing of the "Heat Regulating Apparatus" of Walter Johnson--a system of components that provided automatic temperature controls for multi-room buildings. Patented 1895, US no. 542,733. Johnson's system was widely employed, using pneumatic controls to regulate room temperatures. |
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