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- Motor Controller Used at the Yerkes Observatory, Williams Bay, Wisconsin, circa 1897 -
- circa 1897
- Collections - Artifact
Motor Controller Used at the Yerkes Observatory, Williams Bay, Wisconsin, circa 1897
- Motor Controller Used at the Yerkes Observatory, Williams Bay, Wisconsin, circa 1897 -
- circa 1897
- Collections - Artifact
Motor Controller Used at the Yerkes Observatory, Williams Bay, Wisconsin, circa 1897
- Motor Controllers for the Telescope at the Yerkes Observatory, Williams Bay, Wisconsin, 1932 -
- October 14, 1932
- Collections - Artifact
Motor Controllers for the Telescope at the Yerkes Observatory, Williams Bay, Wisconsin, 1932