EYEPIECE n.
or, Ramsden's eyepiece. -- terrestrial, or Erecting eyepiece, an eyepiece used in telescopes for viewing terrestrial objects, consisting of three, or usually four, lenses, so arranged as to present the image of the object viewed in an erect position.
FERRO-CONCRETE n.
r foundation skeleton of iron or steel bars, strips, etc. Floors, columns, piles, water pipes, etc., have been successfully made of it. Called also armored concrete steel, and reënforced concrete.
FIRE n.
the priming of a gun. -- Fire plug, a plug or hydrant for drawing water from the main pipes in a street, building, etc., for extinguishing fires. -- Fire policy, the writing or instrument expressing the contract of insurance against loss by fire. -- Fire pot. (a) (Mil.) A small earthen pot filled with combustibles,…
FLANGE n.
plate for covering or closing the end of a pipe. -- Flange joint, a joint, as that of pipes, where the connecting pieces have flanges by which the parts are bolted together. Knight. - Flange rail, a rail with a flange on one side, to keep wheels, etc. from running off. -- Flange turning, the process of forming a fla…