By Jeffrey Buck
The technology and size may have changed but these are still used today!
Take a look at the photograph entitled “New Wave: 1941“:

July 1941. “Detroit, Michigan. Women drying their hair in the beauty shop at the Crowley-Milner department store.” Under the Helene Curtis Express. Large-format negative by Arthur Siegel, Office of War Information.
Image | Source
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About Jeffrey S. Buck
I'm currently a Project Manager at Cypress Partners, LLC in Bloomfield Hills, Mich. I graduated from Wayne State University in 2008 with a B.A. in Journalism. Looking to broaden my view of the world, I spent a semester abroad studying at the University of Salford, a Greater Manchester University in England. I enjoy doing an array of activities, including following Detroit sports teams, SCUBA diving, traveling, reading, playing tennis, hand-written letters and going to the movies.
I am the co-founder of the Woodward Spine, a blog about Detroit and its surrounding communities. The Woodward Spine aims to inform its readers about relevant news and events through creative and informative posts in these core areas: news, opinion, entertainment, history, sports and development. The Woodward Spine serves the tri-county metro Detroit area, concentrating mainly on the communities that lie along the Woodward corridor.