Illustrated Companion to the Latin Dictionary/Projectura

This article incorporates text from a publication now in the public domain: Rich, Anthony (1849). The illustrated companion to the Latin dictionary, and Greek lexicon. p. vi. OCLC 894670115. https://archive.org/details/illustratedcompa00rich. 

PROJECTU'RA (γεῖσσον). The beaver of a helmet, so termed because it projects like the eaves of a roof over the top of the face, as is clearly shown by the annexed example (Projectura/1.1) from an original bronze helmet found at Pompeii. The Latin name is quoted by Becchi (Mus. Borb. iii. 60.), but without mentioning his authority; the Greek one is given by Pollux (i. 135.).

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  Projectura/1.1