Really Retro!
Hair Drier Made from Electric Toaster & Vacuum Cleaner (1921)
A simple but effective apparatus for drying the hair with a blast of warm air, or for other purposes where a supply of heated air may be required, is easily made from an electric toaster and a vacuum cleaner. A wooden box, large enough to contain the toaster, is lined with sheet asbestos, sodium silicate (water glass) being used to paste the asbestos paper to the wood.
Openings are cut through opposite ends of the box and metal tubes inserted, over which the air tubes are fastened with light twine. The short air tube, or hose, can be made by sewing together the edges of a strip of closely woven cloth to form a pipe: the longer one is usually supplied with the cleaner. Another piece of tubing, which may be cardboard, is used at the outlet end.
The vacuum cleaner is placed on a sheet of clean cardboard, the nozzle elevated on one or two strips of wood, and the dust bag is removed, so that one end of the short tube can be slipped over the dust-bag nozzle and fastened. The toaster is placed inside the box, the box closed, and the current turned on; when the toaster is well heated, the vacuum-cleaner motor is started. The air entering through the vacuum cleaner is carried through the heated champer and is delivered through the outlet tube on the opposite side.
Popular Mechanics 1922