New Sun Lamp Held in Hand Brands Babies (Dec, 1938)
It seems like you could accomplish the same thing with a sharpie…
New Sun Lamp Held in Hand Brands Babies
A new hand-type ultraviolet-ray lamp makes it easier for nurses in a Brooklyn, N.Y., hospital to brand the initials of a new-born baby on his skin to prevent identification mix-ups in the hospital nursery. Soft ultra-violet rays pass through stenciled initials placed within the easily handled unit to tan the letters on the infant as well as on the mother. Harmless, the identification brand is said to remain visible for a period of two weeks.