That portion of the electromagnetic spectrum usually sensed as heat. Infrared wavelengths are longer than those of visible light, extending into the microwave frequencies. They are used therapeutically as heat, and also to warm food in restaurants.
    

concept

Perihel ultraviolet, infrared : brings health & the sun to your home / Perihel Limited.

Hanovia health lamps : sold through all good class chemists, electrical dealers and department stores / Hanovia.

Therapeutic uses of infra-red rays / by W. Annandale Troup.

Retinal insensibility to ultra-violet and infra-red rays / by L. Webster Fox and Geo. M. Gould.

Electro-medical apparatus / Watson & Sons (Electro-Medical) Ltd.

Infrared radiation therapy sources and their analysis with scanner / by Leopold Rovner.

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Infrared Rays

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Hanovia health lamps : sold through all good class chemists, electrical dealers and department stores / Hanovia.

Therapeutic uses of infra-red rays / by W. Annandale Troup.

Retinal insensibility to ultra-violet and infra-red rays / by L. Webster Fox and Geo. M. Gould.

Electro-medical apparatus / Watson & Sons (Electro-Medical) Ltd.

Infrared radiation therapy sources and their analysis with scanner / by Leopold Rovner.