Focon

The focone is a focusing cone , hollow mirror, or monolithic glass, or fiber optic, made of sintered glass fibers together - optical fibers . The core of each thread has a higher refractive index than the sheath. An image projected onto one of the ends is transferred with the corresponding zooming to the other end. It is used as a concentrator in optical systems with a small angular aperture .

Another meaning: small-caliber guns used in the armies and fleets of the XVI-XVIII centuries, received the names according to the brand of the master: focone (in French "falcon"), foconet (in French "falcon"), whence the name - falconet. The last name of the small-caliber guns remained in the XIX century, until the end of the existence of smooth-bore artillery. Until the second half of the 19th century, smooth-bore guns with charging through the muzzle were mainly used. On ships used as boarding artillery.