A catalogue of next-ray tubes : perpetrated by the All-Lies Every-Needy Corporation (Nullus, Corpus & Co.).

A satirical pamphlet on the radiological supplies industry ("Bloodsucker : another name for x-ray tube maker.") illustrated by PUNCH artist Geo[rge] M[orrow]). Mailed so as to arrive in first post on 1 April 1919. (Jnl. Rön. Soc., July 1919, p.68). One of many similar productions.