Meaning of "Spectacle frame"

A single casting containing the bearings for and supporting the ends of the propeller shafts in a twin-screw vessel. It consists of arms of pear-shaped section extending outboard from each side of the center line of the ship to bosses, taking the bearings of the propeller shafts. Used in large metchant vessels in place of shaft struts or brackets.

Spectacle frame Meaning of