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. Author manuscript; available in PMC: 2019 Aug 8.
Published in final edited form as: Photochem Photobiol Sci. 2018 Aug 8;17(8):1003–1017. doi: 10.1039/c8pp00176f

Figure 4. Incandescent light bath by physician John Harvey Kellogg.

Figure 4.

In the early 20th century, incandescent bulbs were used as a source of therapeutic light in an “electric light bath”. Kellogg was one of the notable inventors and authors of this era. [Fuzheado / Wikimedia Commons / CC-SA-3.0]. No permission needed.